Note: Auction links are affiliate links for which the site may be compensated.
via this Reverb listing
"Quasimidi Rave‑O‑Lution 309 fully loaded with v3.00a OS and all expansions (Audio, Synth & Drum). Comes with 220 V PSU, (original) . In very good aesthetic and operational condition: all pads, knobs, screen, I/O working properly
Well-maintained and stored in a smoke-free, dry environment. Selling due to studio setup changes. c
Key Features:
5‑part groovebox, sequencer, built-in effects
17-voice polyphony, 100 patterns, 16 songs
Expansions add extra synth/drum tracks, FX and audio I/O
Original rack ears included (rare accessory)"
Friday, June 13, 2025
Arturia KeyStep Pro w/ Red & Yellow Oversynth Overlay
Note: Auction links are affiliate links for which the site may be compensated.
via this Reverb listing
"Works great just too much gear trying to focus on. comes in original box with oversynth overlay which is very handy."
via this Reverb listing
"Works great just too much gear trying to focus on. comes in original box with oversynth overlay which is very handy."
Alesis Ion 49-Key Analog Modeling Synthesizer with Custom Hardwood Side Panels
Note: Auction links are affiliate links for which the site may be compensated.
via this Reverb listing
via this Reverb listing
Octave CAT SRM Model 1853 SN B4046
Note: Auction links are affiliate links for which the site may be compensated.
via this eBay listing
"A bold, duophonic analog classic with a reputation for massive tone and underrated flexibility.
This is the Mk II version of the legendary Octave CAT — a U.S.-built synth from the mid-to-late 1970s that offers two VCOs with saw, square, and triangle waveforms (VCO 1 only), cross modulation, oscillator sync, and mixable waveforms. With duophonic capabilities and a famously powerful filter section, the CAT delivers deep bass, snarling leads, and complex drones with ease.
Key Features:
Two VCOs with independent modulation routing
Oscillator sync, cross-mod, and sub-octave options
VCF with audio-rate modulation and noise source
SRM (Series Revision Model) Mk II panel layout with white-only graphics
Bypass switch, modulation source selectors, and fine-tuning control
Serial number B4046
This unit is fully functional and sounds incredible. Cosmetically, it shows normal wear for its age, but everything works as intended.
An increasingly rare and highly regarded U.S.-made synth that stands tall next to the Minimoog, ARP Odyssey, and Pro-One — but with its own unique voice and vibe."
via this eBay listing

This is the Mk II version of the legendary Octave CAT — a U.S.-built synth from the mid-to-late 1970s that offers two VCOs with saw, square, and triangle waveforms (VCO 1 only), cross modulation, oscillator sync, and mixable waveforms. With duophonic capabilities and a famously powerful filter section, the CAT delivers deep bass, snarling leads, and complex drones with ease.
Key Features:
Two VCOs with independent modulation routing
Oscillator sync, cross-mod, and sub-octave options
VCF with audio-rate modulation and noise source
SRM (Series Revision Model) Mk II panel layout with white-only graphics
Bypass switch, modulation source selectors, and fine-tuning control
Serial number B4046
This unit is fully functional and sounds incredible. Cosmetically, it shows normal wear for its age, but everything works as intended.
An increasingly rare and highly regarded U.S.-made synth that stands tall next to the Minimoog, ARP Odyssey, and Pro-One — but with its own unique voice and vibe."
Bad Gear - OverPriced-1
video upload by AudioPilz
"Welcome to Bad Gear, the show about the world’s most-hated audio tools. In light of recent events we are going to talk about OP-1 Field.
While other manufacturers either “pass on savings from process optimization” or relentlessly jack up prices once people are actually buying their music making toys, our favorite interior design company/copyright agency/nepo baby cult just flexed their monstrous marketing muscle and - did both at the same time.
Chapters:
00:00 Intro tune
00:50 Overview Teenage Engineering OP1
01:09 Choose your Price ( $ 1399 or $ 9999 )
01:45 Teenage Engineering OP-1 vs. OP-1 Field
02:13 The Synth
02:36 Drum Sampler / Drum Synth
02:45 How to play the OP-1 Field ( Sequencers )
03:30 LFO
03:37 Tape Machines , Upgrade to 32 Bit Stereo
04:14 New Reverb
04:20 Mixer, Master FX, Output Options ( Radio Transmitter , Bluetooth )
04:51 Build Quality , Thanks
05:03 Hate Screen
05:28 Jam 1 ( PostModern Jam )
06:25 Jam 2 ( Analog Drums Jam )
07:35 Finale ( LoFi 2-Step )
08:05 Verdict"
subroutine ... Elektron Digitone II ... ambient
video upload by substan
"A performance on the Elektron Digitone II.
Recorded in one take.
Mastered in post.
As always ... the project file & music on Patreon.
The great support from my patrons makes all of this possible ... thank you so much guys !! / substan
Substan Bandcamp Page: https://substan.bandcamp.com"
Adventures in Audio - Talking Typewriter
video upload by Manitou Productions
"Today we look at the Talking Typewriter by Petite, circa 1981. What does it do? How does it sound? And what's rattling around inside...? Let's find out!
Chapters:
0:00 What's rattling?
0:12 Titles
0:20 Leaking batteries
1:01 Cleaning the battery terminals
3:52 New batteries
4:55 Power on!
6:00 It speaks the letters
7:42 I try to spell some words
12:52 It speaks the numbers
14:19 Some revelations
15:33 I attempt to open it up
17:13 It keeps its secrets for today
18:29 Outro
18:52 Ivy's Corner"
DIY eurorack modular synth | MOD2 Sample Player : RP2350 based drum module
video upload by HAGIWO
"This module is an open source general-purpose Drum module based on Seeed XIAO RP2350.
Thanks to AI-friendly hardware design, it's easy to create software variations using generative AI.
With general-purpose components and a simple circuit, this module is affordable and DIY-friendly.
Sample player:
WAV sample player.
It is possible to save audio files up to a total of 20 seconds / 18 files.
working documents
https://note.com/solder_state/n/nce8f...
https://note.com/solder_state/n/na31f...
Code with WAV samples included
https://www.patreon.com/posts/code-fo...
PCB gerber data & PCB assy production data Download
https://www.patreon.com/posts/mod2-rp..."
Thursday, June 12, 2025
Oberheim TEO-5 Synth Jam | Percussive FM Arp & Ambient Textures
video upload by Sidetrack Walker
"A pure synth journey with the Oberheim TEO-5 – no talking, no overlays, just evolving textures and raw sonic movement.
This live synthesizer jam explores the rhythmic and textural possibilities of through-zero FM, snappy envelopes, and sample & hold (S&H) modulation. Starting with a tight percussive arpeggiator patch, the track moves into ambient territory midway, using the TEO-5’s built-in BBD delay with endless feedback and rich stereo reverb before returning to its rhythmic roots.
Whether you’re here for synth inspiration, immersive listening, or just want to experience the TEO-5 in action, this one’s for you.
🎧 Headphones recommended!
PS: Apologies for the less-than-ideal lighting — let’s call them lo-fi vibes by accident. The jam deserved to be shared regardless. 😉
🔍 Key patch features (for the synth community):
• Through-zero FM
• Per-step S&H mod oscillator tuning
• Percussive envelope settings
• Stereo voice spread
• BBD delay in feedback loop
• Internal reverb for lush ambience
Thanks for listening!"
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© Matrixsynth - All posts are presented here for informative, historical and educative purposes as applicable within fair use.
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MATRIXSYNTH - EVERYTHING SYNTH













© 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