Custom/Portable ANALOG NOISE Synth

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via this auction - video at the auction and below.

"This auction is for one custom analog synth and mini-amp made by foam_FORM. The "Trigguitar"
adds that sonic grit to taste and grinds it down, too. Features include:
- Atari Punk Console inside (capable of some extremely hardcore analog sounds) controlled by an Arduino Uno.
- 6 selectable LED's can be turned on to conrol the pitch based on their light frequencies and intensities
- 6 Photocells can also mod frequencies (most effective on higher pitches)
- Arpeggio programming is possible (screw off one of the side-plates on the instrument to access the Arduino's USB)
- Can be powered using a single 9V battery or with a choice of 2 different power adapters (slightly different tones).
-High-quality HAPP arcade pushuttons
-Includes a mini metal amp (9v battery powered!) with volume knob, 1/4" input jack, and sound/speaker/hole"

Trigguitar Analog _ one Published on Jun 20, 2013

"Here is an example of how you can use an Arduino (or ATMega-related product) to send CV signals to control an external synth. Here I am controlling an Atari Punk Console by sending a PWM (square-wave pulse using the preset "Blink" code) to a homemade digital-to-analog converter. The converter is made of 2 resistors in series which are connected to the positive pin of an eletrolytic capacitor and the Arduino "common" pin. The CV (where the speaker normally goes) is hooked up to common and the negative side of the capacitor. There you have it-- a cheap programmable CV converter!!!"