Showing posts with label synth guts. Show all posts
Showing posts with label synth guts. Show all posts
Thursday, November 13, 2025
Can We Fix This 1970s JEN SX1000? | Vintage Synth Rescue!
video upload by THIS MUSEUM IS (NOT) OBSOLETE
"Restoring the museum's JEN SX1000 back to life.
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Acid Solder Club Workshop Tickets
https://www.eventbrite.com/e/acid-sol...
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Support the Museum and see more videos and stuff Patreon / lookmumnocomputer"
Wednesday, November 12, 2025
Oberheim Matrix 12 Repair
video upload by Really Nice Audio
"I was lucky enough to be able to restore this amazing instrument.
Hampered at the end by a wrong logic chip installed. From factory? Or 'the last guy'?
Music from my new ATMOS album 'Height Supremacy' under my ATMOS artist name Galactic Horizon.
@Oberheim #repair #oberheim #matrix12 #expander #restoration #synth #synthesizer"
Monday, November 10, 2025
Roland JP-6 Voice Bd, 2 Voice
Note: links to listings are affiliate links for which the site may be compensated.
via this eBay listing
"I was in the middle of trying to resurrect us about fifteen years ago and never got around to finishing it. There's still quite a bit of parts intact and populating the sport so the chances of repair are good."
via this eBay listing
"I was in the middle of trying to resurrect us about fifteen years ago and never got around to finishing it. There's still quite a bit of parts intact and populating the sport so the chances of repair are good."
Sunday, November 09, 2025
Philips Philicorda GM752 oscillator board *working*
Note: links to listings are affiliate links for which the site may be compensated.
via this Reverb listing
"Oscillator board from a Philicorda GM752 organ, fully working"
Looks like gingerbread.
via this Reverb listing
"Oscillator board from a Philicorda GM752 organ, fully working"
Looks like gingerbread.
Saturday, November 08, 2025
Oberheim DMX with MIDI and memory expansion
Note: links to listings are affiliate links for which the site may be compensated.
via this Vemia listing
Note: listings are ending today with a handful extended through Sunday.
Click the auction link on top when you get there for additional listings.
"Fully restored and serviced Oberheim DMX drum machine. Fitted with midi and memory expansion, power supply recapped and serviced."
Pic of the inside below.
via this Vemia listing
Note: listings are ending today with a handful extended through Sunday.
Click the auction link on top when you get there for additional listings.
"Fully restored and serviced Oberheim DMX drum machine. Fitted with midi and memory expansion, power supply recapped and serviced."
Pic of the inside below.
R.A. Moog Troubador Theremin #1 a/s
Note: links to listings are affiliate links for which the site may be compensated.
via this Vemia listing
Click the auction link on top when you get there for additional listings.
"***notice that the theremin needs service*** Up for sale is my R.A. Moog Co. Troubador Theremin with serial number 1001. Which means it's the first one made, probably by Bob Moog himself on 3 October 1969. Unfortunately it's not working. One of the coils is broken and the power lead needs work. It's sold as-is, untested. I've been looking years for a second example to fix this one, without result so far.. Optically there are signs of use, some screws are missing, some wear and tear at the front panel and bottom plate."
Pic of the inside below.
via this Vemia listing
Click the auction link on top when you get there for additional listings.
"***notice that the theremin needs service*** Up for sale is my R.A. Moog Co. Troubador Theremin with serial number 1001. Which means it's the first one made, probably by Bob Moog himself on 3 October 1969. Unfortunately it's not working. One of the coils is broken and the power lead needs work. It's sold as-is, untested. I've been looking years for a second example to fix this one, without result so far.. Optically there are signs of use, some screws are missing, some wear and tear at the front panel and bottom plate."
Pic of the inside below.
Friday, November 07, 2025
Moog Synamps
Note: links to listings are affiliate links for which the site may be compensated.
SN 1080 via this Vemia listing
SN 1127 via this Vemia listing
1080 details follow (1127 further below). Pics of the inside for both below.
Click the auction link on top when you get there for additional listings.
"Extremely rare, extremely heavy, and not fully functional: here is the fabled Synamp from Moog, interestingly a native UK voltage example. The power amp is not working, and the spring tank needs to be replaced. But this is what it does have working well even before servicing: a vintage Moog graphic with drive level control and overload LED, and four channels of comprehensive Moog parametric EQ, each with input gain with overload LED and effects send level, and three sweepable bands for each channel. Cosmetically, check the photos. The important parts are a good 7/10, but some of the rest is not. It's not pristine for sure. But it is a very special piece. CORRECTION: the tatty but original Moog wooden road case goes with the second Synamp in this auction, not this one. That means that there is no reverb tank at all with this one (the tank sits in one of the wooden case lids) - but a pretty simple job to house and connect a replacement. This example is still seriously heavy and solid without the wooden case.
There will be a second Synamp in this auction in non-working condition, and possibly the massive speaker cabinets (as seen) that they were designed to work with - though their huge power could only really be used in a decent sized space. See lots 30464 and 30465."
SN 1080 via this Vemia listing
SN 1127 via this Vemia listing
1080 details follow (1127 further below). Pics of the inside for both below.
Click the auction link on top when you get there for additional listings.
"Extremely rare, extremely heavy, and not fully functional: here is the fabled Synamp from Moog, interestingly a native UK voltage example. The power amp is not working, and the spring tank needs to be replaced. But this is what it does have working well even before servicing: a vintage Moog graphic with drive level control and overload LED, and four channels of comprehensive Moog parametric EQ, each with input gain with overload LED and effects send level, and three sweepable bands for each channel. Cosmetically, check the photos. The important parts are a good 7/10, but some of the rest is not. It's not pristine for sure. But it is a very special piece. CORRECTION: the tatty but original Moog wooden road case goes with the second Synamp in this auction, not this one. That means that there is no reverb tank at all with this one (the tank sits in one of the wooden case lids) - but a pretty simple job to house and connect a replacement. This example is still seriously heavy and solid without the wooden case.
There will be a second Synamp in this auction in non-working condition, and possibly the massive speaker cabinets (as seen) that they were designed to work with - though their huge power could only really be used in a decent sized space. See lots 30464 and 30465."
Roland MC-8 Interface SN 600003
Note: links to listings are affiliate links for which the site may be compensated.
via this Vemia listing
Click the auction link on top when you get there for additional listings.
Pics of the inside below.
"Extremely rare (as you can guess by the serial number 600003), and crucial to the working of the ground-breaking MC-8 sequencer. In very good physical condition, just a couple of minor marks. Untested, as no MC8 was available to attach it to. VEMIA can collect and pack: 9GBP.'
via this Vemia listing
Click the auction link on top when you get there for additional listings.
Pics of the inside below.
"Extremely rare (as you can guess by the serial number 600003), and crucial to the working of the ground-breaking MC-8 sequencer. In very good physical condition, just a couple of minor marks. Untested, as no MC8 was available to attach it to. VEMIA can collect and pack: 9GBP.'
Rhodes Chroma SN 21010234 - beautiful but not working
Note: links to listings are affiliate links for which the site may be compensated.
via this Vemia listing
Click the auction link on top when you get there for additional listings.
Pics of the inside below.
"Rhodes - Chroma (s/n 21010234) - In very good physical condition, but does not work as system locks up at boot up. The power supply was replaced previously, so the troublesome Rhodes power supply was replaced prior to the current problem.. Comes with 2 original Chroma footswitches and the Chroma dual pedal unit. 240V (although switch mode power supply – so should be all OK with 110V)"
See the excellent https://www.rhodeschroma.com for resources.
via this Vemia listing
Click the auction link on top when you get there for additional listings.
Pics of the inside below.
"Rhodes - Chroma (s/n 21010234) - In very good physical condition, but does not work as system locks up at boot up. The power supply was replaced previously, so the troublesome Rhodes power supply was replaced prior to the current problem.. Comes with 2 original Chroma footswitches and the Chroma dual pedal unit. 240V (although switch mode power supply – so should be all OK with 110V)"
See the excellent https://www.rhodeschroma.com for resources.
Thursday, November 06, 2025
Cloney Synthey and DKS
Note: links to listings are affiliate links for which the site may be compensated.
via this Vemia listing
Click the auction link on top when you get there for additional listings.
Pics of the inside below.
"It is complete with DKS keyboard and has been recently serviced by the clone circuit designer Derek Revell. It has a gate input modification but apart from that is unmodified.
It's now at VEMIA, and is in great near-mint cosmetic condition. One catch is a little bit fiddly, but that's about the sum of any problems."
via this Vemia listing
Click the auction link on top when you get there for additional listings.
Pics of the inside below.
"It is complete with DKS keyboard and has been recently serviced by the clone circuit designer Derek Revell. It has a gate input modification but apart from that is unmodified.
It's now at VEMIA, and is in great near-mint cosmetic condition. One catch is a little bit fiddly, but that's about the sum of any problems."
Buchla 208e module / Music Easel
Note: links to listings are affiliate links for which the site may be compensated.
via this Vemia listing
Click the auction link on top when you get there for additional listings.
Pic of the inside back below.
"Buchla / BEMI 208e rev3 module in like new condition. All is good working, better than from the factory. I installed NOS µA726 and (re)calibrated the oscillators tracking, they have similar range and track well, the CO over 4 octaves and the MO over 5 octaves. I scaled the AM so that it reaches full level with the slider all the way up (and not around mid-course like on many units, which twists the waverform and causes modulation at double frequency). I can install it in a powered boat for standalone use. I can do modifications such as stiffer pots, Rogan knobs, dedicated out for each LPG or the CO (to sync the VCS3 Card's oscillator and FM the MO), reverb mix CV input, noise generator... Happy to discuss this with the buyer."
via this Vemia listing
Click the auction link on top when you get there for additional listings.
Pic of the inside back below.
"Buchla / BEMI 208e rev3 module in like new condition. All is good working, better than from the factory. I installed NOS µA726 and (re)calibrated the oscillators tracking, they have similar range and track well, the CO over 4 octaves and the MO over 5 octaves. I scaled the AM so that it reaches full level with the slider all the way up (and not around mid-course like on many units, which twists the waverform and causes modulation at double frequency). I can install it in a powered boat for standalone use. I can do modifications such as stiffer pots, Rogan knobs, dedicated out for each LPG or the CO (to sync the VCS3 Card's oscillator and FM the MO), reverb mix CV input, noise generator... Happy to discuss this with the buyer."
Yamaha CS01 II Monophonic Synthesizer SN 2341
Note: links to listings are affiliate links for which the site may be compensated.
via this eBay listing
Pics of the inside below.
"See video [in the listing while up] for working features. The feet switch works but you sometimes have to fiddle with it. I bought this in the late 1980’s so it is firsthand. I have kept it in a dry healthy environment. It was bought in Europe and I checked it in the US using a European plug and a proper power transformer. The internal loudspeaker doesn’t seem to work. In the video I connected it to an external speaker. Batteries didn’t seem to power up the synth. Not sure why, the connexions are clean. Maybe modern alkaline batteries are weaker than the older ones. This looks like a toy but is actually a very powerful and sought after synth.
TECHNICAL FEATURES
Improved filter: The CS01 II features a 24dB resonant low-pass filter with an adjustable slider for resonance, a significant upgrade from the 12dB filter with a simple on/off resonance switch on the original model.
Sound generation: It includes a voltage-controlled oscillator with selectable waveforms (triangle, saw, square), pulse width modulation, and a white noise option.
Envelopes and LFO: A single ADSR envelope generator controls both the amplifier and filter depth, and a basic LFO can modulate the VCO pitch or filter cutoff.
Portability: Designed for portability, it has a mini-keyboard, a built-in speaker, and can be powered by batteries.
Controls: It includes pitch and modulation wheels, a glissando (portamento) function, and an input for a breath controller.
The CS01 II is a monophonic synthesizer, meaning it can only play one note at a time.
Sound: It is highly regarded by electronic musicians today for its ability to produce "bubbly and growling" bass sounds and other fat analog tones.
Target audience: While its small size and simplicity made it a good beginner's synth when released, its excellent sound quality has made it a valuable instrument for experienced musicians."
via this eBay listing
Pics of the inside below.
"See video [in the listing while up] for working features. The feet switch works but you sometimes have to fiddle with it. I bought this in the late 1980’s so it is firsthand. I have kept it in a dry healthy environment. It was bought in Europe and I checked it in the US using a European plug and a proper power transformer. The internal loudspeaker doesn’t seem to work. In the video I connected it to an external speaker. Batteries didn’t seem to power up the synth. Not sure why, the connexions are clean. Maybe modern alkaline batteries are weaker than the older ones. This looks like a toy but is actually a very powerful and sought after synth.TECHNICAL FEATURES
Improved filter: The CS01 II features a 24dB resonant low-pass filter with an adjustable slider for resonance, a significant upgrade from the 12dB filter with a simple on/off resonance switch on the original model.
Sound generation: It includes a voltage-controlled oscillator with selectable waveforms (triangle, saw, square), pulse width modulation, and a white noise option.
Envelopes and LFO: A single ADSR envelope generator controls both the amplifier and filter depth, and a basic LFO can modulate the VCO pitch or filter cutoff.
Portability: Designed for portability, it has a mini-keyboard, a built-in speaker, and can be powered by batteries.
Controls: It includes pitch and modulation wheels, a glissando (portamento) function, and an input for a breath controller.
The CS01 II is a monophonic synthesizer, meaning it can only play one note at a time.
Sound: It is highly regarded by electronic musicians today for its ability to produce "bubbly and growling" bass sounds and other fat analog tones.
Target audience: While its small size and simplicity made it a good beginner's synth when released, its excellent sound quality has made it a valuable instrument for experienced musicians."
Wednesday, November 05, 2025
Greyface 2600 (4012 filter) & 3604P
Note: links to listings are affiliate links for which the site may be compensated.
via this Vemia listing
Click the auction link on top when you get there for additional listings.
"An excellent condition vintage Arp 2600 semi-modular which contains the sought after (and so-called) pre-lawsuit Moog 4012 style filter. This instrument is at least 50 years old (built between 1972 to 1974) looks beautifully vintage and sounds absolutely amazing.
A full service was carried out by Kent Spong at KSR in July 2024.
Some of the casing has been re-tolexed very well. Both lids are included, and everything is in very good cosmetic condition."
Pic of the inside back below.
via this Vemia listing
Click the auction link on top when you get there for additional listings.
"An excellent condition vintage Arp 2600 semi-modular which contains the sought after (and so-called) pre-lawsuit Moog 4012 style filter. This instrument is at least 50 years old (built between 1972 to 1974) looks beautifully vintage and sounds absolutely amazing.
A full service was carried out by Kent Spong at KSR in July 2024.
Some of the casing has been re-tolexed very well. Both lids are included, and everything is in very good cosmetic condition."
Pic of the inside back below.
Crumar Spirit Modulation Section
Note: links to listings are affiliate links for which the site may be compensated.
via this Vemia listing
Click the auction link on top when you get there for additional listings.
"The modulation panel for the famous Crumar Spirit. We have no idea whether this is in good working order or faulty. Sold AS IS. Packing 3GBP."
Pic of the inside / back below.
via this Vemia listing
Click the auction link on top when you get there for additional listings.
"The modulation panel for the famous Crumar Spirit. We have no idea whether this is in good working order or faulty. Sold AS IS. Packing 3GBP."
Pic of the inside / back below.
Oberheim OB-1 V1 rare early SEM Version - PRO RESTORATION with new Tauntek CPU Board SN 0063
Note: links to listings are affiliate links for which the site may be compensated.
via this Reverb listing
Pics of the inside below.
"Just serviced by the very talented Vintage Standards in Japan October 2025. In my opinion top 3 techs in the world. PSU replaced, every pot disassembled cleaned and re lubricated, crucial caps replaced, tropical fish caps still in perfect condition, brand new Tauntek CPU board installed to keep it reliable for much longer than the original and expanding its memory to 64, uses through hole and modern components for longevity and serviceability. Crucial trimmers replaced to keep tuning and voltage stable. Keyboard cleaned and bushings replaced. Literally everything you need to do to these to keep them going for another 50 years reliably. This is the early SEM version that uses the same discrete VCA as the SEM instead of the chip based version most of them have which is more like the OB-X, love the way these SEM envelopes react. Sound is incredible and it's so awesome having instant preset recall on a SEM and a great interface to control it. These will only go up in value and im only selling because I recently obtained an TVS and its a bit over kill to have both (although awesome having a 3 voice). Selling at a loss already so please be considerate if making an offer."
via this Reverb listing
Pics of the inside below.
"Just serviced by the very talented Vintage Standards in Japan October 2025. In my opinion top 3 techs in the world. PSU replaced, every pot disassembled cleaned and re lubricated, crucial caps replaced, tropical fish caps still in perfect condition, brand new Tauntek CPU board installed to keep it reliable for much longer than the original and expanding its memory to 64, uses through hole and modern components for longevity and serviceability. Crucial trimmers replaced to keep tuning and voltage stable. Keyboard cleaned and bushings replaced. Literally everything you need to do to these to keep them going for another 50 years reliably. This is the early SEM version that uses the same discrete VCA as the SEM instead of the chip based version most of them have which is more like the OB-X, love the way these SEM envelopes react. Sound is incredible and it's so awesome having instant preset recall on a SEM and a great interface to control it. These will only go up in value and im only selling because I recently obtained an TVS and its a bit over kill to have both (although awesome having a 3 voice). Selling at a loss already so please be considerate if making an offer."
Tuesday, November 04, 2025
Rhodes Chroma Apple II Computer Interface
Note: links to listings are affiliate links for which the site may be compensated.
via this eBay listing
Additional Tone Tweakers Listings
"This circuit board came in with one of the many Rhodes Chromas we have bought, restored and resold (we’re finishing another at the moment which we will list soon). It appears to be part of a rare chroma apple ii computer interface that allowed the apple ii computer with sequencing and patch editing software to control a Rhodes Chroma. The Rhodes Chroma website, which is probably the best vintage synth support website we’ve ever come across, has an article on this interface. You can find it by googling rhodes chroma apple computer card. It appears as though there were other components to this interface that we didn’t get with it (converter box, software and possibly more), and we don’t have an apple II computer, so we haven’t tested this item and are selling it as-is as a collectors item, or for parts to possibly get a full system working (with no guarantees)."
via this eBay listing
Additional Tone Tweakers Listings
"This circuit board came in with one of the many Rhodes Chromas we have bought, restored and resold (we’re finishing another at the moment which we will list soon). It appears to be part of a rare chroma apple ii computer interface that allowed the apple ii computer with sequencing and patch editing software to control a Rhodes Chroma. The Rhodes Chroma website, which is probably the best vintage synth support website we’ve ever come across, has an article on this interface. You can find it by googling rhodes chroma apple computer card. It appears as though there were other components to this interface that we didn’t get with it (converter box, software and possibly more), and we don’t have an apple II computer, so we haven’t tested this item and are selling it as-is as a collectors item, or for parts to possibly get a full system working (with no guarantees)."
Thursday, October 30, 2025
Roland Rhythm700 TR-700
Note: links to listings are affiliate links for which the site may be compensated.
via this Reverb listing
Pics of the inside below.
"Now this is a beautiful and very rare gem that you will almost never see for sale; This true analog and unique member of the Roland TR family is very cool: it has lots of adjustable trims inside so shape your drum sounds, like inside the CR-78! This also makes this the perfect vintage Roland moddable analog drum machine. Also: individual outs is easy on this one.
This one is of course after not mint anymore after 50 years, but honestly; despite a few wood flaws it actualy looks very nice still, certainly comparing to other units I have seen.
On the technical side: it works for the most part. On the main output everything seems normal, besides the volume balance seems not entirely accurate, but I have nothing useful to compare. The internal speaker does'nt seem to pass the bass drum. The speaker has been disconnected before for shipping [because not all countries accept speakers being shipped the quick way], maybe something was not re-attached properly. Therefor is sold as 'kind of working but needs technical service'. So sold AS-IS. No returns or [partly] refunds if anything other then described is not working properly. Maybe I am over-accurate here, just want to tell an honest story where others just hope for the best advertising crap as 'in good condition'. Hope you appreciate it!
Volume is rewireable to 120v, its now set to 100V. I have never seen this unit on European voltage to be honest. For all higher voltages you need a simple step down transformer. Or give it a new replacemnet transformer when you are servicing this beast."
via this Reverb listing
Pics of the inside below.
"Now this is a beautiful and very rare gem that you will almost never see for sale; This true analog and unique member of the Roland TR family is very cool: it has lots of adjustable trims inside so shape your drum sounds, like inside the CR-78! This also makes this the perfect vintage Roland moddable analog drum machine. Also: individual outs is easy on this one.
This one is of course after not mint anymore after 50 years, but honestly; despite a few wood flaws it actualy looks very nice still, certainly comparing to other units I have seen.
On the technical side: it works for the most part. On the main output everything seems normal, besides the volume balance seems not entirely accurate, but I have nothing useful to compare. The internal speaker does'nt seem to pass the bass drum. The speaker has been disconnected before for shipping [because not all countries accept speakers being shipped the quick way], maybe something was not re-attached properly. Therefor is sold as 'kind of working but needs technical service'. So sold AS-IS. No returns or [partly] refunds if anything other then described is not working properly. Maybe I am over-accurate here, just want to tell an honest story where others just hope for the best advertising crap as 'in good condition'. Hope you appreciate it!
Volume is rewireable to 120v, its now set to 100V. I have never seen this unit on European voltage to be honest. For all higher voltages you need a simple step down transformer. Or give it a new replacemnet transformer when you are servicing this beast."
Friday, October 24, 2025
Korg PS-3200 Polyphonic Synthesizer SN 210231
Note: links to listings are affiliate links for which the site may be compensated.
via this Reverb listing
This one was listed back in 2011 and 2010.
"This PS-3200 was fully functional until about two years ago, but it has not been tested recently as I do not currently have the power cable and keyboard. (It should be possible to operate the unit by connecting a compatible power cable and installing a Kenton MIDI kit.) All internal components and parts remain original, as shown in the photos. Therefore, it is being sold as-is, with the understanding that some adjustment or servicing may be required after delivery."
Pics of the inside below.
via this Reverb listing
This one was listed back in 2011 and 2010.
"This PS-3200 was fully functional until about two years ago, but it has not been tested recently as I do not currently have the power cable and keyboard. (It should be possible to operate the unit by connecting a compatible power cable and installing a Kenton MIDI kit.) All internal components and parts remain original, as shown in the photos. Therefore, it is being sold as-is, with the understanding that some adjustment or servicing may be required after delivery."
Pics of the inside below.
Thursday, October 23, 2025
Battlescarred Badass Roland SH-101
Note: links to listings are affiliate links for which the site may be compensated.
via this Reverb listing
Pics of the inside below.
She ain’t gonna win any beauty contests, but she can kick your “I buy mint only” friends SH101’s butt any day.
Electronically perfect, cosmetically weird SH. It’s my fault…it was a UV-greened olive to brown gradient mess when I got it and I tried whitening the case and left it under UV lamps too long. You can see the original color on the battery door. While my process works wonders for keys and buttons, not so much for gray cases I guess. Oh well.
Despite the now quirky camo exterior, the electronics, rear case and keys are perfect. Power button is solid, no amount of wiggling and wobbling impacts anything. All functions were checked against another SH that I own (I’ve owned 4 and know them inside and out) and everything is spot on. All faders lubed with Deoxit F5, no crackles or jumps. There’s none of the dreaded battery leakage or other liquid damage present. It’s very clean, and as you’d expect sounds massive.
Properly matched PSU included."
via this Reverb listing
Pics of the inside below.
She ain’t gonna win any beauty contests, but she can kick your “I buy mint only” friends SH101’s butt any day.
Electronically perfect, cosmetically weird SH. It’s my fault…it was a UV-greened olive to brown gradient mess when I got it and I tried whitening the case and left it under UV lamps too long. You can see the original color on the battery door. While my process works wonders for keys and buttons, not so much for gray cases I guess. Oh well.
Despite the now quirky camo exterior, the electronics, rear case and keys are perfect. Power button is solid, no amount of wiggling and wobbling impacts anything. All functions were checked against another SH that I own (I’ve owned 4 and know them inside and out) and everything is spot on. All faders lubed with Deoxit F5, no crackles or jumps. There’s none of the dreaded battery leakage or other liquid damage present. It’s very clean, and as you’d expect sounds massive.
Properly matched PSU included."
Vintage Kurzweil K 150 FS Fourier Synthesizer (Model K-150FS) Rack Mount SN 87060023
Note: links to listings are affiliate links for which the site may be compensated.
via this eBay listing
Pics of the inside below.
via this eBay listing
Pics of the inside below.
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© Matrixsynth - All posts are presented here for informative, historical and educative purposes as applicable within fair use.
MATRIXSYNTH is supported by affiliate links that use cookies to track clickthroughs and sales. See the privacy policy for details.
MATRIXSYNTH - EVERYTHING SYNTH
