Synthesizer Ads From the Past - PPG Monkey, PRISM, DCS II, Synthia and More

You'll find the scans on Scott From Canada

Also check out scott3eh on Flickr
Some of the rarer items pictured here:
Adaptive Systems Synthia 1980
Kinetic Sound Prism 1980
Strider DCS II
Synclavier II Terminal Support Package 1981
Wersi Condor DMS 1984
Bob Moog on the Fairlight

The full list at the time of this post:
Adaptive Systems Synthia 1980
Akai AX80 1984
Aries Modular 1977
arp omni-2 ad 1980
Crumar Stratus 1981
crumar t1-b ad 1980
Emulator 1 1982
Ensoniq ESQ-1 1986
Fairlight-bob moog 1982
hohnar keyboards ad 1980

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Sequential Circuits Drumtraks 8 bit digital drum machine

Note: Auction links are affiliate links for which the site may be compensated.
via this auction

"Sequential Circuits Drumtraks - SCI Drumtraks - (digital samples run through 2 x CEM 3320 analogue filters) with MIDI IN / OUT and Trigger OUT. UK voltage model.

1984 vintage 8-bit drum machine designed by the electronic music legend, Dave Smith, with MIDI and programmable Velocity and Tone...

Note on operating system

This has the all important v0.4 operating system which is the most suitable for using the Drumtraks with your DAW sequencer (see note below). Please check the second picture which shows DRUM 04 ROM and the sound ROMs.

From winecountrysequential (the world-renowned Sequential Circuits spares and repairs shop in the US):

Operating System ROM DRUM 0.4 offers:
OMNI and POLY modes over 16 MIDI channels
MIDI Pads-Out commands
Velocity sensitivity via MIDI.

This is the best version for using Drumtraks as a sound module with a MIDI sequencer."

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SEQUENTIAL CIRCUITS DRUMTRAKS / Tweaking the Legend

Published on Apr 12, 2016 LESINDES

"Tweaking the legendary 8 bit drummer by Dave Smith SEQUENTIAL CIRCUITS DRUMTRAKS ."

SEQUENTIAL CIRCUITS DRUMTRAKS / Tweaking the Legend 2

Published on Apr 14, 2016

Sequential Circuits Drumtraks | Cosmic

Published on Sep 20, 2018 Alex Ball

"The Sequential Circuits Drumtraks is an overlooked unit, perhaps because of the Linn, Roland and Oberheim classics that came first, or perhaps because Sequential are so famous for their legendary synthesizers. Either way, it has a very punchy sound and reminds me of the DMX and LinnDrum.

I was interested to see that Tame Impala had made use of one on the Currents album and combined with the "May peace prevail on earth" message on the circuit board; I thought I'd try some space pop rather than something 80s.

Instruments used:
Drums: Sequential Drumtraks (1984) and PastToFuture Drums
Bass Guitar: Fender Jazz Bass / Orange OB1-300 / DBX 266XL
Electric Guitar: Squier Jagmaster (1998) / Blue Junior II / Vox Wah / Ibanez Tubescreamer / Boss CE-2 Chorus / SM57
Acoustic Guitar: Alvarez Baritone / AKG C414
Bass Synth: Sequential Circuits Pro-One (1981)
Polys: Roland Juno-6 (1982) / DSI Prophet REV2 (2017)
Dirty Synth: Korg MS mark I (1978)
Electric Piano: Rhodes Mark I Seventy-Three (mid 70s)
Vocals recorded with an AKG C414
Harp: GForce Mtron Pro
TamTam & Cymbals: Spitfire Joby Burgess Percussion

Plugins: Waves, Goodhertz, U-he, Past To Future reverbs, T-racks
Sequencer: Cubase 9.5"

Sequential Circuits Prophet~600 | By Design

Published on Nov 21, 2019 Alex Ball

"Another synth demo, this time with the Sequential Circuits Prophet~600 buddied up with its siblings.

This synth was the very first instrument released with midi (with Dave Smith of Sequential being the "father of midi"). He was later awarded a Grammy for its invention along with Ikataro Kakehashi of Roland. It was famously hooked up to a Roland Jupiter-6 at the Winter NAMM of 1983 to demonstrate that a universal protocol had been achieved.

The Prophet~600 was the third of this iconic series to be released after the Prophet~5 (1978) and Prophet~10 (1980). With their eye on affordable poly synths such as the Kory Polysix and Roland Juno-60, Sequential looked to create a cutdown version of their earlier Prophets and the 600 was the result. Around 6,000 of them were made between 1983 - 1985.

It has 6-voice polyphony with two oscillators per voice and has mixable saw, triangle and pulse available on both of those oscillators. The VCOs are identical to those found in the Prophet~5 rev3, Pro~One and Prophet~10 but the other ICs are different.

It has a resonant low pass filter, two envelopes, an LFO, poly mod, glide, oscillator sync, unison mode, patch memory, an arpeggiator and two sequencers.

And here's where things get interesting: the 600 has digitally generated envelope, LFO and glide voltages as well as digital values for the switches and potentiometers. In order to keep the cost down, an 8-bit Z80 processor and DAC were used that didn't quite have the spec to perform these functions at the speed or with the resolution that was ideal (it was 1983 after all). The result was that the envelopes weren't snappy enough and when sweeping the filter you can hear it stepping through the values.

Most owners rectify this and unlock the potential of the 600 with the GliGli mod that replaces the old processor with a modern one and also adds a bunch of features and the unit I'm using has this upgrade. We now have increased resolution, extra LFO modes, multimode envelope generation, unison detune, noise source, mix overdrive, full midi implementation and more.

In terms of physical changes, the oscillator mix potentiometer is now the Oscillator A level and the portamento the Oscillator B level. The envelope amount is now bi-polar with level 5 being the 0 volt point. The other updates are accessed via the numeric pad and speed dial whilst in manual mode.

I made all the sounds in manual mode and also used some timed automation of various parameters in places via midi.

Instruments used:
Sequential Circuits Prophet~600 (1983)
Sequential Circuits Pro~One (1981)
Sequential Circuits Drumtraks (1984)
Ibanez Jem 7DBK (2002)
Fender Blues Junior II mic'd with an SM57
Boss CE-2 (1979)"

Sequential Circuits Drumtraks Drum-Machine

YouTube via retrosound72 | June 30, 2010

"vintage gear demo by RetroSound

Sequential Circuits 'Drumtraks' Drum Machine from the year 1984

The SCI Drumtraks is a very easy to use 8-bit sample-based drum machine from the early eighties with a very powerfull sound. 13 drum sounds with programmable tuning and level control. The Drumtraks can also send DIN sync and clock.

This demo video shows the instruments, pattern record and and some pattern of the Drumtraks." I used no external effects, EQ or compression. Only the pure Drumtraks sound."

Sequential Circuits Drumtraks Demos

YouTube Uploaded by VisceralVoids on May 13, 2011
via this auction
"Running through some favorite beats I made on my Drumtraks, an 8-bit sample based drum machine from 1984 with real-time volume & tuning controls. It has the same 24db Curtis chip used in the DMX. It was one of the first MIDI devices, so with a keyboard, you can input beats with velocity sensitivity. I believe tuning tweaks can also be recorded live per beat. One thing that sucks for Roland fans, is that Drumtraks has no step-time mode.

Since the "holy grail" Linn LM1 costs as much as a mortgage down payment these days, and LinnDrum and DMX prices are only going to go up, I would consider the Drumtraks a great alternative if you like the sound of 80s digital drum machines. Although not very popular, this is clearly an 80s drum machine to the bone!

NOTES: I am using the mono-out into a Behringer Xenyx 1202FX wth a tad of reverb and effects stuff here and there. No snares are used in this video. I am using a Roland footswitch to change the beat sometimes due to issues with the keypad. Left LCD = tuning of the instrument and volume depending on which knob you use, right LCD = the beat you are on."

Sequential Circuits Drumtraks Demo - SCI Drumtrax Live 2

Sequential Circuits Drumtraks - MIDI Drum Machine (1984)

Note: Auction links are affiliate links for which the site may be compensated.

via this auction

Pics of the inside below.

"The Sequential Circuits Drumtraks was the first drum machine that supported MIDI. (The Drumtraks can also send DIN sync and clock.) And while the drum pads were not velocity-sensitive, you can control it via a MIDI keyboard and trigger it with different velocities. While the kick sound is a bit thin, the 13 8-bit sounds can be pitch-shifted dramatically, adding some flexibility.

VOICES
Main core 8 bits NEC D780C-1 CPU part of Z80 ZILOG family manages 6 channels:

Channel 1: Bass Drum
Channel 2: Snare / Rim
Channel 3: Tom 1 / Tom 2
Channel 4: Crash cymbal / ride Cymbal
Channel 5: Open / closed HH
Channel 6: Claps / tambourine / cabasa /cowbell

WAVETABLE
Features 13 PCM waveforms at 8 bits resolution stored on socket EPROMS Erasable Programmable Read Only Memories. Each sound features individual gain and a pitch tune quantised into 15 different steps.

EPROM
It is possible to change the soundset by swapping the eproms, use a prommer for this task.


FILTER
The TOM channels are filtered by famous chip Curtis Cem3320

SEQUENCER
Records in real-time mode or step mode
Recording quantisation at variable resolution levels from 1/2 to 1/96 in ten values: 1/2, 1/4, 1/6, 1/8, 1/12, 1/ 16, 1/24, 1/32, 1/48, 1/96 or swing shuffle.

SYNC
Internal frequency tempo range from 40 to 250 BPM, sync mode available in 2 ways:
1- digital Midi clock 
2- analog sync IN at 24 /48 /96 PPQ resolution
Drumtraks outputs at 24 or 48 PPQ resolution

MIDI
Each sound is triggered with velocity levels and pads output MIDi with dynamic.

MEMORY
Holds 3289 notes, 99 patterns (100 measure) and 99 songs.
Data can be saved either to :
- midi exclusive dump
- tape backup"

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Funk LeBlanc - Sequential Circuits Drumtraks and Prophet 6 Sound Demonstration

video upload by Funk LeBlanc

"♥️ Support the funk, check out the store, and get the coolest stickers in town!! https://funkleblanc.com 😎

I really love Sequential Circuits. When I heard that Dave Smith was going to come out with a completely new polyphonic synth, I had to have it. I got inspired to create an original song only using the Sequential Prophet 6 and the Sequential Circuits Drumtraks."

Sequential Circuits Drumtraks SN 05765 Secret Message

Note: Auction links are affiliate links for which the site may be compensated.
via this auction

"May Peace Prevail on Earth"

"Sequential Circuits Drumtraks with anvil case and 3 swappable Digi-Drums EPROM sound chips

- solid, reliable, built like a tank
- this drum machine has never crashed
- very rare
- separate output channels for each instrument, as seen in photo 9
- 3 Digi Drums EPROM sound chips: African Drum, Electronic Snare #2, spare TOM
- solid Forge/Anvil case
- used condition, scratches here and there from typical usage/age
- Volume knob has it's cover missing, as seen in photo 6. An original knob can be purchased through Sequential Circuits dot com, or Wine Country Sequential dot com. I've included a different replacement knob on the pot.
- all buttons and pads work, but a couple of the number pads are a little touchy, and may need cleaning"

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ALESIS HR-16 DRUM MACHINE WITH LINN, OBERHEIM, SEQUENTIAL CIRCUITS SAMPLE EPROMS

Note: Auction links are affiliate links for which the site may be compensated.
via this auction

"This auction is for a absolutely mint Alesis HR-16 in perfect working order, this comes with all original packaging, midi cable, power supply, instructions and two sets of EPROM sound chips. The pictured set are the original ones which are in perfect order, but in the Alesis I have installed a new operating system chip and two EPROM’s filled with high quality classic drum samples.

On the installed EPROM’s all 49 original sounds have been replaced with a selection of Linn LM-1, LinnDrum, Linn 9000, Oberheim DMX, Oberheim DX, Sequential Circuits Drumtraks, Emu Drumulator, Emu SP12 and Emu S1200 samples (see the full list of samples below).

This item can be collected from East London and please don’t hesitate to get in touch if you have any questions.

The installed full list of samples are as follows:

— DMX Clap
— DMX Kick
— DMX Shaker
— DMX Snare
— Drumtraks Closed HiHat
— Drumtraks Crash Cymbal
— Drumtraks Kick
— Drumtraks Open HiHat
— Drumulator Clap
— Drumulator Clave
— Drumulator Closed HiHat
— Drumulator Cowbell
— Drumulator Kick
— Drumulator Open HiHat
— Drumulator Ride Cymbal
— Drumulator Rim
— Drumulator Snare
— Drumulator Tom
— DX Tom
— Linn 9000 Conga
— Linn 9000 Cowbell
— Linn 9000 Electronic Tom
— Linn 9000 Kick
— Linn 9000 Ride Cymbal
— Linn 9000 Snare
— Linn 9000 Tambourine
— Linn 9000 Tom
— LinnDrum Clap
— LinnDrum Closed HiHat
— LinnDrum Conga
— LinnDrum Kick
— LinnDrum Open HiHat
— LinnDrum Snare
— LinnDrum Snare23
— LM-1 Choke HiHat
— LM-1 Clap
— LM-1 Clave
— LM-1 Conga
— LM-1 Kick
— LM-1 Medium HiHat
— LM-1 Rim
— LM-1 Snare
— LM-1 Tambourine
— LM-1 Tight HiHat
— LM-1 Tom
— SP12 Kick 1
— SP12 Kick 2
— SP1200 Kick 1
— SP1200 Kick 2"

Modded SEQUENTIAL CIRCUITS DRUMTRAKS with 21 Extra Eproms

Note: Auction links are affiliate links for which the site may be compensated.

via this auction

Pics of the inside below.

"SEQUENTIAL CIRCUITS DRUMTRAKS
Digital Drum Machine (1983)
one of a kind ! professional modified with several modswitches to get extra samples and sounds (switch and mute) !
used by German (Berlin) music project TOK TOK !

DRUM MACHINE Main panel features a segment display, 13 dynamic trigger pads, 9 buttons and numeric pad.
Back panel terminal connectors:
- main outputs
- 6 seperate outputs
- clock out
- metronome out (it generates +5V pulses)
- tape interface
- Midi interface

VOICES main core 8 bits NEC D780C-1 CPU part of Z80 ZILOG family manages 6 channels polyphony, each channel features 2 settings:
- individual volume gain
- pitch tune quantised into 15 different steps.

WAVETABLE 13 PCM waveforms at 8 bits resolution stored on socket EPROMS Erasable Programmable Read Only Memories.
TECH: TOM channels are filtered by famous chip Curtis CEM3320.
potChannel 1: Bass Drum potChannel 4: Crash cymbal / ride Cymbal
potChannel 2: Snare / Rim potChannel 5: Open / closed HH
potChannel 3: Tom 1 / Tom 2* potChannel 6: Claps / tambourine / cabasa /cowbell

SEQUENCER record in real-time mode or step mode.
Recording quantisation at variable resolution levels from 1/2 to 1/96 in 10 values: 1/2, 1/4, 1/6, 1/8, 1/12, 1/ 16, 1/24, 1/32, 1/48, 1/96 or swing shuffle.

SYNC internal frequency tempo range from 40 to 250 BPM, sync mode available in 2 ways:
- external Midi clock
- analog sync IN at 24 /48 /96 PPQ resolution, but Drumtraks outputs only at 24 / 48 PPQ resolution.

MIDI each sound is triggered with velocity levels and pads output MIDI with dynamic.

MEMORY:
- 3289 notes
- 99 patterns (100 measure)
- 99 songs
Data can be saved either tomidi exclusive dump or tape backup

included are 21 extra eproms - very hard to find ....."

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Inside a Sequential Circuits DrumTraks

via this auction

"Lovley 12 bit sampled drum machine, compliments other SCI synths with lovley wood cheeks.... The Sequential Circuits Drumtraks was the first drum machine that supported MIDI. (The Drumtraks can also send DIN sync and clock.) And while the drum pads were not velocity-sensitive, you can control it via a MIDI keyboard and trigger it with different velocities, the 13 8-bit sounds can be pitch-shifted dramatically, adding some flexibility."

Drumtraks: Sequential's answer to the LinnDrum (includes FREE SAMPLES)

Published on Jul 18, 2019 Alex Ball

"I've been planning to giveaway a detailed sample pack of my Sequential Circuits Drumtraks and so I thought I'd tell you a bit more about the machine whilst doing that.

Download the sample pack:
http://bit.ly/Drumtraks

As mentioned in the film, much of the specific information about Sequential Circuits comes from 'The Prophet from Silicon Valley' by David Abernethy and I thoroughly recommend getting a copy if you're into synth history. [you can find it on Amazon here]

Some of the original adverts and posters come from Retro Synth Ads.

The Boss DR-55 footage was shot by Ra Smith at madFame for my Roland documentary, so that's recycled here. Ra has been putting out a very cool series called 'Synth Quest' so go have a look. [episodes posted here]

Thanks for watching!"

Previous posts featuring Alex Ball

Aeroplane Studio Tour With Future Music

Published on Aug 20, 2013 FutureMusicMagazine·306 videos

Synths come in at 3:45.

"Aeroplane aka Vito de Luca takes Future Music on a tour of his gear packed studio. We think you will agree that there is something for everyone in this studio."

In the studio: ARP Odyssey, Octave Kitten, E-mu SP-1200, Analogue Solutions Red Square, Sequential Circuits Pro-One, Roland SH-101, DSI Prophet '08, Moogerfoogers, WMD Geiger Counter, Eventides, EHX Graphic EQ, Analogue Solutions SEMblance, Roland SH-1000, Sequential Circuits Prophet-5, Roland Jupiter-8, JX-3P, Juno-106, Yamaha DX7iid, Ensoniq ASR-10, KORG KMS-30, ARP 2600, Critter and Guitari Pocket Piano, Clavia Nord Piano, iPhone, Moog Minitaur, Access Virus. In storage: Oberheim DMX, Roland TR-808, Sequential Circuits Drumtraks, Simmons Clap Trap, Teisco Analog Echo, Roland TR-707, Yamaha RX-5, KORG DDD-1, Roland SH-32, EHX Voice Box, BOSS DR-220a, KORG Percussion, Wersi Rack, Yamaha TX-81Z.

Vintage Synth Scans

Click here for pdf scans of various synth brochures and articles. I tried to list all models below. Apologies for the long list but if you are searching for this stuff via your favorite search engine, this is the only way it'll come up, and finding that oddball rare scan can be absolute gold.


Roland
JX-8P and PG-800, JX-3P and PG-200, Jupiter-6, Juno-106, Synth Plus-60 (HS-60), SH-101 and MGS-1, EP-50, MPU-101, MPU-103, TR-707. TR-909, TR-606, TB-303, CR-8000, CR-5000, SBX-80, MSQ-100, MSQ-700, JSQ-60, BOSS Dr. Rhythm DR220A and DR-220E, Alpha-DRUM DDR-30/PD-10/PD-20, Alpha Juno-1 and Alpha Juno-2, DEP-5, DG CMU-810 Compu Synth, Juno-106, Juno-6, Super JX JX-10, MKS-100, MKS-50, MKS-7, MKS-70, SBX-80, SDE-3000/1000/2000, TR-505, Octapad PAD-8, TR-727, Jupiter-8, MC-8, System 700, CPE-800, VCA-800, System 100M, System 100, Jupiter-4, Promars, SH-2, SH-09, CSQ-600, CSQ-100, SH-1, SH-5, SH-2000, SH-7, SH-3A, SH-1000, VP-330, RS-09, RS-505, SA-09, SIP-300, SIP-301, SPA-240, SPA-120, SPV-355, SVC-350, SBF-325, SDD-320, SPH-323, SMX-880, SRE-555, RE-502, DC-30, DC-20, CR-78, CR-68, TR-66, MKB-1000, MKS-30, MKB-300, MKS-10, MKS-80, MPG-80, JX-3P, MC-4, MM-4, MC-202, MIDI-DCB, MTR-100, CV Interface, Piano Plus-400 HP-400, Piano Plus-300 HP-300, RE-150, RE-501, RT-1L, MPU-104, MPU-105, Cube-100 (CK-100), Cube-60 (CK-60), Cube-40 (CK-40), KS-2, KS05, KS-6, KS-11, KS-1000, TB Series Carrying cases, PSA AC Adapters, KS-1100, SC series soft cases, AB series resin-molded cases, MR-1, RH-10, DP-2/6, FS-1/2/3, M-16C/64C, BR-2/3, RD-1000, MKS-20, MKB-200

Yamaha (note the documentation adds the - in the descriptions. So you CS70M in the title, but CS-70M in the body). I thought that was interesting.
CP-30, CP-20, GS-1, CP-10, CP-11, CS-70M, CS-40M, CS-20M, MQ802, CP-80, SK-50D, SK-15, CS-15D, CE-20, CS-01, CS-15, CS-5, SK-30, SK-20, SK-15, SK-10, GS-2, CE-20, MA-10, MM-10, MH-10, KS-50, KS-100, E1005, E1010, MQ802, CP-80, CP-70B, CP-35, CP-25.

Korg
PS-3300, PS-3200, PS-3100, PS-3010, PS-3040, PS-3050, PS-3001, VC-10, MS-10, MS-20, MS-50, SQ-10, MS-03, MS-02, MS-01, 800DV, 700S, 900PS, M-500SP, PE-2000, PE-1000, KA-180, FK-3, FK-1, V-C-F, Mr. Multi, SE-500, SE-300, EM-570, SP-2035, SM-20, Mini Pops 120W 120P, Mini Pops 7, Mini Pops 45, Mini Pops 35, Mini Pops Junior, Korg Quartz, WT-10A, GT-6, RT-10,

Vintage Synth Story - magazine scans
Crumar DS2, Sequential Circuits Pro-One, RSF Kobol, Roland TB-303 and TR-606, TR-808, PPG Wave Computer, PPG Wave 2, Oxford Synthesizer Company OSCar, EMS Polyvoks, Oberheim OB-X, Octave-Plateau Voyetra Eight, EMS Polysynthi, Moog Minimoog, LinnDrum, Korg PS-3100, Korg MS20, EMS Synthi AKS, ELKA Synthex, ARP Sequencer, ARP Quadra, Korg Polysix, Korg PS-3200, Moog System 3P, Korg Trident mkII, Moog Liberation, Memormoog, Mutron Bi-phase, Oberheim 2 Voix, Oberheim Xpander, PPG Wave 2.3, Roland CR-78, Roland VP-330, RSF PolyKobol, Moog 960 and 961, Sequential Circuits Prophet 10, Vox Super Continental, Yamaha CS-15, ARP, Chroma, Sequential Circuits Drumtraks, EMS Vocoder 5000, E-MU Drumulator, Korg Story, Yamaha CS70M, Korg, Synton Syrinx, Roland MC-4, Oberheim 6 voix, Simmons SDS V, Simmons SDS.3, PolyKobol RSF, Keyboards Synthe Story Part 1 and Part 2.

Sequential Circuits Drumtraks 400-2 Vintage Drum Machine Synth 0.5 Upgraded SN 3938 - Secret Message

Note: Auction links are affiliate links for which the site may be compensated.

via this auction

"Offered is Sequential Circuits Drumtraks. It has been upgraded to 0.5 which is the last operating software offered. It has been tested in all parameters. The sequencer, record, swing, measure, time signature etc all work properly, midi working, song functions work, outputs, drum tuning, volume etc all work as they should. All the LEDs are working as they should and are nice and bright. The "ride" button has been working sporadically in the past and lately not working. The contact may need to be cleaned or perhaps replaced. The circuit board is in nice shape, everything looks in proper order, battery for the memory is working. The button for the tempo "slower is a replacement and not original. One foot on the bottom is a replacement. This unit is in nice shape with some scratches on the front panel and some wear to the wood panels. Classic rhythm machine used by Prince, Orbital, etc."

"May Peace Prevail on Earth, ASS"

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Sequential Circuits Drumtraks Vintage Drum Machine SN 2656

Note: Auction links are affiliate links for which the site may be compensated.

via this auction

"Sequential Circuits Drumtraks 400

Vintage drum machine! In great condition. Everything works great, and cosmetically it is amazingly clean, with little to no signs of wear."

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SEQUENTIAL CIRCUITS DRUMTRAKS 400

via this auction
"Sequential Circuits DRUMTRAKS model 400 drum machine. Simple to use, you can construct highly complex and convincing rrhythmic arrangements using this machine/ flexible, multi-track sequencer; individual instrument volume and tuning, swing balance (a very useful tool), accents, tempo changes, etc. Instruments include Bass, snare, rim, tom 1, tom 2, carsh symbal, ride cymbal, closed hi-hat, claps, tambourine, cowbell (more cowbell!), and cabasa--each instrument sample is professionally recorded for studio-quality sound and character.

Two modes; pattern and songs (up to 99 songs can be defined). Midi-interface is available on this unit. However, I have not tested it. The "snare" button is a little bit intermittent--once the pattern is programmed it is not an issue at all."

Sequential Circuits Drumtraks

YouTube via jakeschrock. "sequential circuits drumtraks drum machine"