70's MOOG SATELLITE SYNTHESIZER SN 2176725

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"This one is warn down and needs some refreshing or part it out."

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Korg Volca Modular Micro Modular SN 018550

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Roland The Synthesizer 2nd Edition

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"This is the full, complete set of The Synthesizer, 2nd Edition. Published in 1979 by the Roland Corporation. It consists of 4 volumes:

Practical Synthesis for Electronic Music, Volume One
Practical Synthesis for Electronic Music, Volume Two
Multichannel Recording for Electronic Music
A Foundation for Electronic Music

There is also included the original dust cover in which all 4 volumes fit. It has a tear at the top of the box (see photo). Other than that, all volumes are in excellent condition. No marks or dogears. I bought this in 1979 and have moved it everywhere with me."

Roland System 100 MODEL 101 Monophonic Synthesizer SN 430170

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"This 101 is in perfect working condition and in very good condition!! This unit was professionally checked/serviced/cleaned by professional technician."

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GRP A4 Synthesizer

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According to the listing, this is the same one featured in this 2019 video.

"3 VCO's, 2 filters with their own distortion circuits, filters can be used sequentially or in parallel.2 EG's, 2 LFOs, Ring Mod, Noise source, Envelope follower, Autopan, Sample/HoldExtensive midi implementation and... an incredible sequencer."

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Patch of The Week: 'Filter Drums' Part 1 - Analogue Cowbell w/ Fixed Filter Bank 914 (& VCF Clave)

video upload by AJH Synth Official

"This week's patch is the first of a short series showing ways to use filters for vintage rhythm/drum machine percussion style sounds, beginning with an analogue cowbell-type sound using the Fixed Filter Bank 914.

00:00 Patch of The Week: 'Filter Drums'
02:07 Patch Sheet

Some filters can be used to create tones without any input sound, simply by pushing them into self-oscillation (raising resonance beyond it's threshold point), but the Fixed Filter Bank is not a regular filter/VCF, so it works a little differently. Rather than controlling the overall frequency of the filter, each of it's bandpass filters has a preset frequency, for which you control the level. On the AJH Synth module they are deliberately tuned to one of two pitches when pushed into feedback, which makes it more musically useful. Here, I mix in some white noise to add texture to the feedback frequencies.

For comparison, I also included the Ladder Filter here to demonstate how a typical VCF (which can self-oscillate) can be controlled by a sequencer, with the steps controlling the pitches it produces. The point is that either module has it's advantages when used to synthesize particular sounds. In this video the ladder filter is producing simple tuned claves."

Patch of The Week: No-Input Filter Drums Part 2 - Using VCF Self-Oscillation to create Percussion

video upload by AJH Synth Official

"This week's patch shows some ideas for using self-oscillating analogue filters to produce vintage drum machine inspired sounds, the basis of which can be used to emulate such sounds as the clave, bongo, cowbell, and kick/bass drum of early rhythm boxes. I used the sounds of the Roland CR-78, TR-77 and Acetone FR-2L as inspiration here, but in a later Patch of The Week video I'll be recreating some sounds of 70's machines more directly, using VCOs and noise sources. In the meantime, the methods contained here might be of interest to those wanting to make some simple percussive accompaniment with a limited number of modules. At the end of the video I'll show some vintage-inspired patterns using the modular as a 4 voice drum machine, without needing to use samples or a sampler. Patch notes and link to downloadable patch sheet below.

Index:
00:00 Intro
00:25 VCF Clave
01:12 Fixed Filter Bank Bongo/Cowbell
02:27 Gemini 2412 Bongo
03:20 VCF Kick/Bass Drum"

Oxi One Piano Sequencing

video upload by Oxi One Piano Sequencing

"Using the #OxiOne as a sequencer for some minimal piano stuff. So one sequencer on the Oxi is set to chord mode providing some chord changes but is actually not sequencing anything, while the 3 other sequencers are set to harmonizer mode which basically quantizes all notes going on there to the scale of the chord sequencer. The other sequences contain a straight mono arpeggio, a poly notes sequence as well as a polyrhythmical sequence. On top there’s a LFO modulating the note velocity over a couple of bars and a pinch of random velocity and pitch induced. Oxi One is sequencing #Noirepiano running on a nearby laptop via bluetooth. Visuals made with HeavyM software synced via Ableton Link."

O5-The Baldwin Fun Machine- Why it is a synthesizer: Auto Mute!

video upload by AutomaticGainsay

"Here is the first part of a two-part demonstration of the sound and functionality of the "auto mute" function on the Baldwin Fun Machine."

AutomaticGainsay Baldwin Fun Machine posts

BOSS RV 500 Sound Demo (no talking) with Modal Cobalt 8

video upload by Bonedo Synthesizers

Arduino DIY Sequencer for synthesizers with variableclock

video upload by KellerDev

"I implemented in the code a way of sequencing inspired by MFOS variclock sequncer and the intelligel metropolis, where you can set the amount of clock each step takes, before it goes to the next. That way you can longer melodies with fewer steps, and set repeating notes easier."