Circuit Bent Casio SK-1 with Patchbay and Sequencer

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video by SMMP

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"Incredibly Rare Circuit Bent Instrument - Casio SK1!!!

This one is an augmented machine, different than many circuit bent instruments. Whether you want to use it to make experimental music, sound design, electronic music etc, this instrument provides you with a huge palette of sounds due to the many hard patched glitches, pitch control and particularly thanks to the coloured patch bay in the breakout control box. Here you can also patch ROM points to 4 LFOs (!!!!) in order to create patterns and rhytmic phrases. There is also a programmable sequencer, based on logic chips, which runs in two directions and has some degree of variations in it.

It features:
- Pitch control (with LFO to have vibrato) - Body Contacts - Many Glitches on the main keyboard (these glitches short pins on the ROM board of the keyboard, distorting and originating new sounds/patches) - Patchbay with ROM points, Ground, 4 modulating LFOs
Step Sequencer
- 8 adjustable steps - 1 knob for sequence tempo and a switch to increase speed - Switch to run backwards - 6 switches to create different sequence patterns - input for external clock for the sequencer (not tested)
PSU is not included in this listing."

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Handmade DIY Synth - Sound/Noise Generator 5 oscillators madness with CV in

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video by SMMP

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"This is a Synth/Noise Generator/Toy/Portal I built completely from scratch. The circuit I designed starts from basic schematics you can find in the datasheet of the main sound generator IC (40106 and 4046). The ways the oscillator interact are based on almost random routing and wiring, going through several logic gates, including a 4066 if I remember well, for automatic switching.

There are 2 LDR, although the video don't make much justice to their function. If on certain setting, it will produce different sound at night rather than during the daytime. You can experiment pointing a torch to the LDR or to bend over them to modulate the sound (it affects the behaviour of two oscillators, in ifferent configurations).

There is also a nice area with bolts sticking out. If you touch two of them, particularly after licing your fingers, you can dramatically control the sound.

There are switches that controls the routing of the oscillators or enable larger capacitors, LEDs to make it funky, and some sort of CVin (minijack). I played a bit with conductive dough I made with my son, but it would be cool to try it with veggies and fruits, more bodies touching while exchanging fluids and so on.

The case is made of stained recycled pallet wood (pine) which I joined using fingers joints and then it's been sanded and polished several times using danish oil. The panels are old circuit board that were skipped in an educational environment and that I recycled from being dumped. Rather than using them as PCB here they are used like panels."

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