MATRIXSYNTH

Roland System 100M 112/121/130/140/150/191-J

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SNs:

191 092215
112 132427
121 122112
130 111985
140 132924
150 001404

Wersi CX1 Wersimatic

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Service:
Recap of PSU
Voltage regulators (7815/7915) are replaced by new ones.
The keyboard contacts were serviced.
Push switches were serviced with IPA.
Several suspicious looking solder joints were reflown.
A better power cable was installed.
220V/50 Hz.

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1979 MTI Auto Orchestra AO-1 Analog Synthesizer / Drum Machine

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"The unit is fully functional and works as it should.

This is the very rare MTI Auto Orchestra AO-1 drum machine / bass synth / strings / chords accompaniment unit + bass pedals and cover for the front of the box.

This thing is pretty insane. The Drum machine sound is off the hook!

The MTI AO-1 has many different drum presets and each preset button has 2 variations. Each drum voice has its own cancel button (!) so you can choose whatever elements of the beat you want (say just kick drum, kick + snare, cancel the cymbal, cancel conga, etc.) so the combinations are pretty much endless.

Very powerful bass sound. reminiscent of the TB 303. Strings section and chords section.

When no drum preset is chosen, you can play the bass and strings manually using the pedals. When a preset is chosen, the pedals will determine the chord.

The volume knobs of the different sections can be pulled for constant signal. When these knobs are pulled, they control the volume for its assigned section."

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KORG ELECTRIBE EA-1 Analog Modeling Synthesizer SN 001375

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Roland Phrase Lab MC-09 SN ZP71189

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Stylophone Gen X-1 : A true small and fun synthesizer

SynthedMind

"The new stylophone Gen X-1 is like the old and original, but with lots of new and great features.
The original sound can also be achieved by setting all controls to OFF position.
But when you start rotating or switching these, a new sonic world opens !
It's a handy small and affordable little synthesizer and has following features :
- Attack - Decay controls : these set the rise and fall of the pitch or filter cutoff.
- LFO : this is a low frequency oscillator to modulate the pitch of the tone. You can select between square or triangle. The speed and modulation depth can be set.
- Delay effect : this is an effect to "echo" the sound output. You can control delay time, repeat time and balance between dry or effect.
- Low pass filter with cutoff and resonance.
- Pulse width modulation : this creates more harmonics to the sound.
- 1-Octave and 2-Octave sub oscillators. These add depth and lower sounding notes.
These can be freely mixed with the Pulse width modulation.

- A very good build in amplifier and speaker which produce deep and warm sounds.
- It's handy and very compact. The stylus is a new way of playing music. You can slide over the notes.
- A ribbon controller : this can also be used for adding extra notes when playing with the stylus.

By tweaking the knobs many normal or strange sounds can be achieved, just like a real synthesizer.
I found a warm and synthed sound and demonstrate it in this video.
I also demonstrate the pulse width modulation and sub oscillators."

$20 100 DSP effects karaoke FX board review (no talking) with novation circuit/for diy guitar pedal

HAGIWO modular synthesizer channel

You can buy it from aliexpress.
It is very low cost , but qualiry is pretty gooood!

I'm planning to build it to modular synthesizer.

effect list:
00-:small hall
03-:medium hall
06-:large hall
09:church
10-:small room
13-:medium room
16-:large room
19:hall

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D501 VCF Demo (no talking)

DoveAudio

"A quick play around with some of the features of the Dove Audio D501 VCF which is based on the NJM2069 VCF/VCA chip.
Here the Q911 drives a moon modular quantizer into two WTFs set to sawtooths for the oscillators, fed into a mixer and into the D501.
The Q119 also clocks a quad AD/AR module (schematics in my blog) and the output of the D501 goes into the corsynth QuadVCA where a little is set to the FX capacitor with a delay before going into my desk.
No EQ and recorded straight into my ID14 and my PC.

Sorry for the blurry picture, I forgot to clean my camera lens"