Note: Auction links are affiliate links for which the site may be compensated.
via this Reverb listing
Pics of the inside below.
"In good condition,with ide hard drive,and ram expansion,capacity shown in photos. Includes power cable. Back panel is missing expansion cover,and as is common on these models, one or two of the rotary encoders(data knobs) can be finicky."
Sunday, May 25, 2025
RF dawless jam 147bpm
video upload by Radical Frequencies Modular
"Patch: Bass is the Dpvco mixing the alpha square with beta saw slightly detuned into the RF transistor mixer and into SH Vcf. The decay of the envelope filter is voltage controlled by Lucky Voltages giving a bit more groove.
The lead is a simple saw into the Diode Dream Vcf which can make internal fm from Vcf input to the filter cv frequency. This resonance sounds so bubbly and glassy with beautiful mid high frequencies!
All drums are from different sources mostly analog mixing into a vintage 70s mixer. The jam is directly recorded into daw. Sequencing is done with Beatsteppro."
Tre Modular - Liminal Space Demo
video upload by Tre Modular
"Liminal space is Eurorack delay module that has two parallel cores that share the same repeat line. Both of these cores are based on PT2399 IC. Even though PT2399 is not an analog IC, we have made sure that Liminal space sounds and feels like classic analog delays of the past. Each of the cores has different supporting circuitry. This changes what sounds get passed through the delay and how fast they fall off. This results in unique interaction between both of the cores. We have also added Modulation input that lets you modulate both channel speeds in an eerie way that produces That nostalgic sound.
Huge thanks to Lelde for lending her hands and talent.
More info www.tremodular.com"
Machinedrum Randomizer MDPatch for Monome Norns #elektron #machinedrum #monome #norns
video upload by HANJŌ
"Excited to share MDPatch, second of a series of Elektron Randomizers for Monome Norns. It is now available free for the Monome community. This one’s been a real labor of love, built in collaboration with my friend @syntheticjudah, founder of Machine Store—the same force behind the recent resurrection of +Drive support for legacy Elektron machines.
MDPatch is a patch randomizer and performance tool designed specifically for the Elektron Machinedrum, running on Norns. You can explore, randomize, and control synth parameters in real-time via MIDI. It’s a great way to breathe new life into old machines and spark unexpected sounds.
MDPatch came out of countless late-night sessions digging into the legacy Elektrons and wishing for a more playful, exploratory way to shape sounds without diving through menus. With Norns as the brain and MIDI as the bridge, this tool lets you sculpt, mutate, and chance upon new patches in a really immediate way.
We’ve structured it around a 16-page layout—each one corresponding to a track of the Machinedrum and you can find subpages (SYNTH, EFFECTS , ROUTING). You can toggle parameters for randomization, send new patches instantly, and keep that sweet hands-on Elektron flow intact.
Big thanks to this community for being such a constant source of inspiration over the years. If you’ve got suggestions, ideas for expansion or want to share what you make with it—please drop it below"
Saturday, May 24, 2025
Korg MS-04 Modulation Pedal
Note: Auction links are affiliate links for which the site may be compensated.
video upload by Edward Jones
via this eBay listing
Pics of the inside below.
"For sale we have the very rare Korg MS-04!
These don’t come up for sale very often.
This is a modulation expression pedal.
It features an LFO (Triangle or Square), a noise generator, and a "bender" type control voltage output, controlled by this sturdy foot switch.
The pedal controls the magnitude of the CV output of the LFO, not the frequency of the LFO.
There is an upward facing LED on the pedal body that shows you the speed of the LFO.
This is in honest to goodness as new condition. The internal date stamp indicated manufacture to be the 6th week of 1980 (which matches the manufacturing period).
There is some light dust on the pedal after being in storage for 20 years, and I haven't cleaned it off. The only blemish is on the front plate indicating model number, where a price tag was placed in the late 1990s when it was purchased by the current owner. I haven't attempted to de-goo it.
One side appears to still have the original protective plastic on it.
All components are original! The tested capacitors have held their values, and the pots were all clean. It has been stored with no batteries inside, and the battery bay, as you can see, is clean as a whistle."
video upload by Edward Jones
via this eBay listing
Pics of the inside below.

"For sale we have the very rare Korg MS-04!
These don’t come up for sale very often.
This is a modulation expression pedal.
It features an LFO (Triangle or Square), a noise generator, and a "bender" type control voltage output, controlled by this sturdy foot switch.
The pedal controls the magnitude of the CV output of the LFO, not the frequency of the LFO.
There is an upward facing LED on the pedal body that shows you the speed of the LFO.
This is in honest to goodness as new condition. The internal date stamp indicated manufacture to be the 6th week of 1980 (which matches the manufacturing period).
There is some light dust on the pedal after being in storage for 20 years, and I haven't cleaned it off. The only blemish is on the front plate indicating model number, where a price tag was placed in the late 1990s when it was purchased by the current owner. I haven't attempted to de-goo it.
One side appears to still have the original protective plastic on it.
All components are original! The tested capacitors have held their values, and the pots were all clean. It has been stored with no batteries inside, and the battery bay, as you can see, is clean as a whistle."
Mermaid - Oberheim TEO-5 Stylophone DS-2 Walrus Qi Etherealizer Korg NTS-1 Ambient Jam 05/24/2025
video upload by I Love Cats and Synths
"A relaxing ambient jam using a new patch I created on the Oberheim TEO-5, accompanied by the Sylophone CPM DS-2 drone synth. Effects for TEO-5 were provided by the Walrus Audio Qi Etherealizer pedal, and the Korg NTS-1 (offscreen) provided effects for the DS-2. Recorded on a Zoom H6."
Improv on Yamaha #cs80 and Hardware (!) Lexicon 224X
video upload by Jose's Vintage Keys
"It's just great to play the real thing - amazing how this almost 50 year old digital machine can sound. And great to have the true #vangelis combination! #bladerunner"
Also featured:
Roland JX10
Oberheim OB-X
Ymaha CP-70 w/ MIDI
Sequential Prophet-5
Fender Rhodes
Roland VP330
Moog Minimoog
E-mu Drumulator 8 Kits + MIDI upgrade board
video upload by Harry Axten
https://hkadesign.org.uk/d8km.html



"ROM switcher boards and third-party sound ROMs are nothing new as far as the E-mu Drumulator is concerned – in fact both were available while the machine was current. JL Cooper Electronics and others made 3-kit boards, and Digidesign (who later became Avid) got their start producing alternative sound ROMs for the Drumulator under their original name of Digidrums. That said, while the various alternative ROM sets are easy to come by these days, ROM switcher boards are not, and without one it’s a total pain to keep swapping chips in and out as you have to take out 8 screws on the underneath of the thing, lift off the lid, swap 5 chips over and put it all back together again.
8 Kits
I wanted a modification very much in the same style as my TR-707 ROM expansion board, with a number of kits that you can instantly switch between. As with that project, this is done without the need for any additional switches and instead uses a microcontroller to snoop on the front panel switch matrix. Kits are selected by holding down one of the bottom row of buttons marked 1-8 and pressing the ENTER button. The selection is remembered when the Drumulator is powered off too.
The Drumulator’s sounds are stored across 4x 16kB ROM chips, although they form one continuous region of memory. Thanks to this, and due to the way that they’re selected, it’s really easy to replace all four with a single large capacity chip. The 512kB flash ROM that I used can hold 8 kits worth of sounds, which works out nicely as that’s the stock sounds plus 7 of the Digidrums kits, including the famous Rock Drums kit:
Stock kit
Digidrums Alternate Drum Set 1
Digidrums Electronic Drums 1
Digidrums Electronic Drums 2
Digidrums Rock Drums
Digidrums Jazz Drums
Digidrums Latin Percussion
Digidrums African + Misc Percussion
Because each kit also has a corresponding modified program ROM (as the length of sounds, locations in memory and channel assignments are all hard-coded into the Drumulator’s firmware); the D8KM board also has an EPROM which contains the relevant OS for all 8 kits, and is connected to the Drumulator’s OS ROM socket with a ribbon cable. Fortunately the Drumulator doesn’t care if the OS ROM changes while the machine is running as long as they’re all the same version, which they are – ‘P3.00’, the final version.
MIDI
I chose also to include MIDI functionality as part of the upgrade, as most Drumulators don’t have it. E-mu did offer a retrofit, which has been cloned over the years, but it’s very basic and only does MIDI notes. The D8KM board on the other hand also offers the ability to sync the sequencer to incoming MIDI clock. Just set the Drumulator to external clock and if MIDI clock is available, it will automatically override the external clock signal and will also start and stop playback. If MIDI clock is not available the Drumulator will use the external clock signal as normal, including for the tape loading functionality."
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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