AM1031 Multipurpose Filter

video upload by O.Z. Hall

TIMECODE
0:00 - Intro
1:02 - Front Panel Controls
2:15 - History and Description
3:18 - ARP 1047 vs AM1031 - Peak Mode
4:09 - A/B audio test 1 - Notch based phase shifter sound
5:52 - A/B audio test 2 - Notch vs Peak with varying Resonance (Q)
9:46 - Conclusion

"Buy Me a Patch Cable
https://buymeacoffee.com/ozhalljr

This video examines the AMSynths AM1031 Multipurpose Filter. This state variable filter was created by Dennis Collin who also created the ARP 1047 Multimode Filter. The two filters are similar, but the 1031 includes an addition response called Peak.

My 1047 video, part 1
Behringer ARP 2500 1047 Multimode Filter Part1 - Resonator/Percussion [posted here]

None of these links are affiliate links.

The AM1031 product page. https://www.amsynthstore.co.uk/produc...

AMSynths Plans 2024 - Ten ARP 2500 Modules! [posted here]

Demo of the Peak response of the
Triangulum Research AT 327, which is a 2018 clone of the AR 327 Aries module. [below]

AT 327 basic demo

video upload by brokenwave

"This is a simple demonstration of the AT-327 Multimode Filter from Triangulum Research.
The AT-327 is a multimode filter based on the Aries AR-327; a filter designed by Dennis Colin in 1975 for Aries Inc. in Massachusetts. Dennis Colin designed many important filters for ARP, Aries, and Oberheim, but the Aries filters are hard to come by. Their design is similar to that of the ARP 1047, but was simplified to reduce cost and make use of newer components that had come on the market as of 1975.
I have a particular fondness for the rich and sometimes gristly analog timbres produced by the Aries System 300 modules, and as challenge to myself, decided to adapt their designs to the very popular eurorack standard. This is the first character in the series."

AMSynth's Introduces the AM1013 Octave Fixed Filter Bank - Band Pass Perfection

video upload by AMSynths

"AMSynth launch the next 'lost module' of the ARP 2500. Eight 12dB fixed band pass filters in parallel, each with a nice gentle resonance. Individual outputs, mix outputs and a bypass feature. Perfect for post processing sounds, More resonance can be dialed in with VCA module feedback loop that uses the dual inputs and outputs."

"This 14HP module is a re-imagining of the ARP 1013 octave filter bank that was announced in 1970 by Tonus as part of the 2500 Synthesizer, but it never made it into production. It consists of eight band pass filters with their cutoff frequency spaced one octave apart, from 63Hz to 8kHz.

The filter is very useful for creating formant and vowel sounds. The individual outputs enable voltage control of the filter by using eight external VCA's - for example the 1032 Mixer & Distributor module.

The AM1013 is based on contemporary Op Amp based filter bank designs, such as the EMS Eight Octave Bank from April 1971. It uses a 12dB high pass filter in series with a 12dB low pass filter to create eight band pass filters that are connected in parallel and set one octave apart. The filters have a fixed frequency and Q of 5.0.

The eight filter outputs are mixed into a single output with two jack socket. Each filter can be adjusted for level using the ARP 2500 style control knobs. The input and output levels can also be adjusted using the front panel potentiometers.

High quality WIMA polypropylene capacitors have been used to ensure a beautiful sounding filter. The filter has a bypass feature which can be set using the push button switch (with green LED). The wide frequency range from 16Hz to 8KHz, Q of 5.0, individual outputs and high quality sound make for a unique module that takes its heritage from 1971.

The 1013 pairs nicely with the 1032 Mix & Distributor module, where each band pass filter output is patched into a VCA, enabling time domain mixing of the fixed filter sounds."

EP 2 - New 2500 Modules - AM1028 Seq Volts use cases

video upload by O.Z. Hall

See the announcement post here.

"This video is the second in a series on a number of new modules from Amsynths which are companions to the Behringer ARP 2500 series of eurorack modules.

This video explores the AM1028 Sequential Volts from Amsynths to expand the Behringer 1027 Sequencer in the 2500 series.

Here are excerpts from Amsynths description of this module:

This 8HP module expands the capability of the Behringer 1027 sequencer by adding an additional column of variable control voltages.

The eight steps of the 1027 are mirrored in the 1028 with three precision control voltage outputs; one at 2V for controlling VCO's and two at 10V for controlling filters, amplifiers and VC env gens.

The AMSynths AM1028 fills in a piece of history by recreating the Slave Module, which we call Sequential Volts.

Buy Me a Patch Cable
https://buymeacoffee.com/ozhalljr

Here's a ( not affiliate ) link to the module:
https://www.amsynthstore.co.uk/produc...

The User Manual:
https://www.dropbox.com/scl/fi/fe65mf..."

TIMECODE
0:00 - Intro to the AM1028 Sequential Volts module
4:00 - Use Case 1 - Extra 2 Volt CV output for the 1027
4:30 - Use Case 2 - Use the 2 Volt CV to control the 1027 Internal Clock
5:11 - Use Case 3 - Use the 1027 Outputs A, B, C as a waveform via the 1050 Mix Seq w/audio rate
9:20 - Use Case 4 - 24 step sequence via 1050 seq switch plus AM1027 for 8 step sequence
10:48 - Use Case 5 - Use 1027 Channel C as a gate bus to drive 1003 Envelope to Voice 2 filter
12:36 - Conclusion"

EP 1 - New 2500 Modules - AM1004P Oscillator Mixer

video upload by O.Z. Hall

"This video is the first in a series on a number of new modules from Amsynths which are companions to the Behringer ARP 2500 series of eurorack modules.

Besides introducing the series, this video explores the AM1004P expander from Amsynths for the Behringer 1004 VCO in the 2500 series.

Here are excerpts from Amsynths description of this module:

The AM1004P module enables the Behringer 1004 module to be transformed from a T (toggle) version into a P (potentiometer version).

The AM1004P module has individual outputs available on jack sockets. Each waveform can also be mixed, using five small trimmer potentiometers, into the output channel, which has an overall MIX LEVEL potentiometer. and two mix jack socket outputs.

The AMSynths AM1004P fills in a piece of history by recreating the original ARP design using a Behringer 1004 module as a basis for expansion.

Buy Me a Patch Cable
https://buymeacoffee.com/ozhalljr

Here's a ( not affiliate ) link to the module:
https://www.amsynthstore.co.uk/browse...

The User Manual and build document:
https://www.dropbox.com/scl/fi/6s9nrc..."

TIMECODE
0:00 - Intro to Series on Amsynths 2500 Eurorack modules
1:22 - Amsynths background
3:36 - ARP 2500 VCO offerings
5:14 - AM1004T Expander
6:50 - Use Case 1 - individual outputs to "event sequence" them
9:02 - Use Case 2 - route an individual output for a parallel signal path
10:47 - Use Case 3 - mixing waveforms to booste or cut the fundamental frequency
14:56 - Use Case 4 - complex LFO waveforms
17:54 - Conclusion

AMSynths AM1035 Triple Modulator Review

video upload by AMSynths

"54 years after ARP made a prototype module with three analog mulipliers AMSynths have launched the production version in Eurorack. Each multiplier can be a ring modulator, a VCA or a mixer. Create ambient and experimental soundscapes with this powerful module. Learn about the features and listen to an awesome demo."

AM1028 Sequential Volts - Expand your Behringer 1027 Sequencer

video upload by AMSynths

"AMSynths expands the B1027 sequencer with an additional column of eight steps of control voltage. The included 12-way ribbon cable connects the two modules internally. CV outputs of 2V and 10V ranges are available. The 2V output is ideal for VCO's and can be patched via a quantizer (used in the video). The 1028 was envisaged by ARP in 1970 but never manufactured until now."

"This 8HP module expands the capability of the Behringer 1027 sequencer by adding an additional column of variable control voltages. The module connects to the B1027 with an included 12 way ribbon cable.

The eight steps of the 1027 are mirrored in the 1028 with three precision control voltage outputs; one at 2V for controlling VCO's and two at 10V for controlling filters, amplifiers and VC env gens.

In 1970 ARP planned to make a slave module for the 2500 1027 sequencer but it never made it into production or prototype stage.

The AMSynths AM1028 fills in a piece of history by recreating the Slave Module, which we call Sequential Volts. It is an easy to understand and use module; just plug it into the Behringer 1027 module with the included 12-way cable and enjoy another column of step CV's!

The AM1028 can be placed next to the Behringer 1027 or close to the module it is controlling, reducing patch cable lengths. Multiple AM1028 modules can be connected to one long ribbon cable, thanks to the CMOS buffering chips and diode protection in the module. or the AMSEQBUS pcb can be used to connect mutiple modules.
High quality Alpha potentiometers and Rogan knobs have been used to ensure control voltages can be easily set and adjusted. The 2V output is designed to drive VCO's and increases the resolution of the control pots."

AM1004P Osc Mixer - Expand your Behringer 1004 VCO

video upload by AMSynths

"AMSynths takes the B1004 to new soundscapes, with five individual waveforms AND a waveform mixer in just 8HP. A simple DIY installation and you have the most powerful VCO that ARP invented!"

Curious if this is the first add on to a Behringer product and the first manufacturer to to so. If you know of any others feel free to comment.

AMSynths Plans 2024 - Ten ARP 2500 Modules!

video upload by AMSynths

"A detailed explanation of the new ARP 2500 modules that AMSynths are delivering in 2024. New filters, oscillatos, modulators, envelopes and sequencer expansion."

ARP 2500 - The Lost Modules

video upload by AMSynths

"The full extent of the ARP 2500 Modular synthesizer is revealed, with 15 modules uncovered for the first time!"

AMSynths 100m Modules deeper Review (8111, 8120, 8131, 8132, 8133, 8141, 8171 & 8176)

video upload by Knobs & Switches

"höre is my deeper review about the 100m Modules from AMSynths. Complete Synthvoices with VCO, VCF, VCA, Sequential Switch, etc..."

Amsynths AM8171 Quad Sequential Switch

video upload by O.Z. Hall

"When Roland developed the System 100M they created a quad signal gate module, the 171, which also had a ton of multiples. The AM8173 module contains the same four signal gates built with modern components, and an onboard LFO clock, making it a very useful sequential switch, for both audio and CV signals.
This video is NOT sponsored/compensated by Amsynths. The following is NOT an affiliate link.
Here is a link to the module: https://www.amsynthstore.co.uk/produc...

TIMECODE
0:00 - Introduction
0:30 - Installation (in my System 55)
1:28 - Detailed look at Inputs/Outputs/Controls
3:00 - Use Case 1 - Single Gate
4:10 - Use Case 2 - Two Gates - alternating with Sequential Clock
8:28 - Use Case 3 - Audio or CV Multiplexor - Event Sequencer or CV Modulation Sequencer
9:57 - Conclusion
10:26 - Bonus footage"

SEM vs SEM - November 2023 edition

video upload by John Schussler

"The G-Storm Electro SEM VCF arrived the other day, and I figured I'd give it a listen in comparison to what, up to this point, I think is the best SEM eurorack module: the Studio Electronics SEM VCF.

(Spoiler alert: The G-Storm gives the SE a serious run for its money)

I've also thrown in the Bubblesound SEM20 and an AMSynths Obie XA. The Bubblesound is mostly SEM, but with some MS-10 bits grafted on that makes it more aggro. The Obie XA isn't a SEM at all, different chip, but is also modeled after an Oberheim filter so I figured I'd toss it in for contrast.

VCO is a Befaco Pony, first on saw then on square. Sequencer is a Clank Chaos. Envelope is Zadar.

Be forewarned: a lot of this video is me going back, and forth, and back, and forth, and back and forth between modules. Don't get seasick.

00:00 Intro
00:20 Standard gain
03:43 Gain up
06:46 Resonance up
08:56 Tight envelope
16:00 Square wave"

AM8122 Dual SVF (100M)

AM8122 BRIEF DEMO video upload by AMSynths

via AMSynths

"Overview The original Roland 100M (1978) has only one type of voltage controlled filter, 24dB low pass. This rather limits the range of sounds that can be created with the synthesizer and it is strange that Roland never ported the 703 2-pole OTA SVF into the 100M format. The AM8122 closes this gap and provides two 2-pole State Variable Filters in one 16HP module.

AMSynths Design The AS3320 chip is used to create the SVF, rather than the CA3080 OTA in the original 703 module. This is partly down to the limited PCB space for two filters and partly because the 3320 chip in SVF mode sounds very good, think Oberheim OBX. An alternative approach would be to build a dual Jupiter 6 SVF with AS3109’s, but this is tricky to achieve given the limited PCB space and we already produce a Jupiter 6 module – the AM8060 module.

The AM8122 circuit reuses the 2-pole SVF in the AM8325 and adds the BP mode and voltage controlled resonance. The third CV input is used as the Resonance CV input. The front panel design follows the Behringer 121 module with signal and CV input trimmers, frequency and resonance on 30mm sliders and green and red indicator LED’s.

Each filter has two outputs, with a slide switch selecting which filter output goes to which jack socket. The upper jack socket (OUT) can be set to either LP, BP or HP and the lower jack socket (REV OUT) follows the reverse (HP, BP, LP). This approach ensure the LED’s track the filter mode selected by the switch, whilst still providing individual outputs of each filter mode. The three signal inputs of the second filter are normalised to the outputs of the first filter (HP, BP and LP), so that the filter modes can be mixed together and filtered again!

Front Panels The panels use the same manufacturing process as the earlier AMSynths 100Mmodules, with a white silk screen over a dusty grey powder coated panel.

Outcome & Availability The module and panel were designed in December 2022. In 1Q23 the prototype PCB’s were debugged, with the revised LED drive and increased filter output levels so they are all the same (10V p-t-p). Production modules will be availble in 3Q23. The AM8122 will be the first AMSynths module to use SMD manufacturing processes (JLCPCB) for the PCB’s."

New AMSynths DIODE-01 Based on the Roland System 101 + 102 Extras

AMSynths, makers of various Roland clone modules is coming out with a complete desktop synth based on the Roland System 101, named the DIODE-01. Some info and pics follow.

"NEW SYNTH ALERT: Here is the aluminium panel for the AMSynths DIODE-01 analog synthesizer. It is an accurate replica of the Roland System 101 with its diode ladder filter, combined with the extra features of the 102 (Ring Mod, S&H). The prototype will be ready in October. What do you think?"

CLICK FOR MORE »

AMSynths 100M Module Update

video upload by AMSynths

"An update on the new AMSynths range of Eurorack modules that re-imagine the Roland 100M prototypes of 1978, and add exciting new modules and features. Seven modules are in development with release dates from May 2023. New powder coated panels with white silk screen lettering have been developed over the last few months, along with custom components."

New AMSynths AM8109SE Low & High Pass Jupiter 8/4 Filters Eurorack Module

"This module is replication of the Low Pass and High Pass Filters from the legendary Roland Jupiter 8 and 4. This is a 2 and 4 pole OTA design that Roland first used in the Jupiter 4 in 1980, replacing a discrete version of the filter which took up more PCB space.

This is a warm sounding filter with smooth frequency control and a resonance that gradually increases up to full resonance, just before self oscillation, a sound very reminiscent of the early 1980's. The original Jupiter 8 filter did not self oscillate, and we have retained this configuration. However the customer can set the filter to self oscillate by adjusting a PCB trimmer on the rear of the module.

The difference between 2 and 4-pole modes is not dramatic, with the 2-pole mode providing a more gradual cutoff slope and silky sound. The high pass filter provides a gradual cutoff of low frequencies.

The AM8109SE is a new version of the 2010 AMSynths design, with slide potentiometers and a skiff friendly module depth of 35mm.

Eurorack Module: 14HP wide
User Manual: AM8109 Quick Start Manual

This module is an accurate reproduction of the Jupiter 8 low pass voltage controlled filter, using the AS3109 OTA chip in the filter core, as well as the high pass filter that uses an AS662 chip. The design has been updated to use modern components with high quality capacitors in the signal path. It delivers a very warm and smooth sound.

There are front panel sliders for adjusting the Cutoff Frequency and Resonance of the low pass filter, and level control of 3x control voltages (MOD, ENV and KYBD) and 2x audio signal inputs. The high pass cutoff frequency is adjusted using a rotary potentiometer with an original Boss coloured control knob.

There are five 3.5mm jack sockets at the base of the black anodised 2mm front panel;
2x audio inputs
3x control voltages
1x audio signal output
There is an audio output jack at the top right of the module. The slope of the filter can be switched between 2 and 4 poles using a small slide switch, and the envelope CV signal can be inverted using a second slide switch.

The module comes with a set of M3 mounting screws and washers, and a standard Doepfer power cable."

AMSynths 2023 Module Plans

video upload by AMSynths

"AMSynths plan to release a new range of Eurorack modules in 2023 inspired by the Roland 100M. Thsi video provides an overiew of the first five modules that are in development. They are a combination of originals being reworked and expanded, prototypes replicated and many new ideas. These accurate designs, that use high quality components, will truely inspire new electronic music."

Amsynths AM1047K Kybd Percussion for Behringer 1047 Multimode Filter

video upload by O.Z. Hall

"The Amsynths AM1047K Keyboard Percussion module is a companion to the Behringer ARP 2500 series 1047 Multimode Filter. Check it out.

Here's a link to this module in the AMSynths store: https://www.amsynthstore.co.uk/AM1047..."

AMSynths SUPERBOOTH Module News - April 2022

"Getting Ready for SuperBooth 22

We are hard at work developing new modules for launch at the best synth show of the year - Superbooth 22. We will be announcing the red faced AM8101 filter [posted here], a replica of the low pass filter in the Roland SH-101, as well as the AM8102 SH-2 style filter [below].

The AM8109 and AM8060 Jupiter filters are being relaunched - 10 years after they were introduced, with Special Edition and slim 10HP versions. AMSynths will also be announcing SH-101, Jupiter 6 and 8 VCO's to pair with these filters alongside the current Jupiter 4 VCO and VCF."

This module is faithful replica of the filter from the legendary Roland SH-2 that was released in 1979. The AM81012 is a fantastic sounding 4-pole low pass filter with that unmistakable Roland filter sound in a narrow skiff friendly, Eurorack module.

The module use an Alfa Rpar AS622 chips in the filter core (BA662 clones) and high quality polpropylene filter capacitors. The design includes buffering Op Amps to interface to Eurorack modular levels. The filter does not have Q compensation but the signal level does not decrease dramatically with higher Q settings. The resonance is smooth and controllable into self-oscillation, and the filter will oscillate from 20Hz to 20kHz.

There are slide potentiometers (with LED's) for adjusting the Frequency Cutoff, and the frequency modulation from Keyboard, LFO and Envelope CV signals, There are rotary potentiometers for adjusting the mix between two audio inputs and Resonance. There is a small slide switch to select whether the envelope CV input is Normal or Inverted.

The AM8102 is hand built with high quality components, including Wima polypropylene capacitors, Alpha potentiometers, and TR808 style control knobs.

There are six 3.5 mm jack sockets on the front panel:
2x audio inputs
3x frequency CV inputs
1x audio output
The module comes with a set of M3 mounting screws and washers, and a standard Doepfer power cable.

New AMSynths SH-101 Eurorack Filter Module in the Works

via AMSynths

"The next new module from AMSynths will be the AM8101 VCF. A faithful recreation of the the low pass filter in the SH-101 mono synth. We expect to start shipping production modules with red anodised aluminum panels in April. #eurorack #eurorackmodular #amsynths #analog #synthesizers"