SOUND LAB SCRIBBLES
analog mini synthesizer
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This mini synthesizer, Scribbles, is Health Club Music's analog patch synth that is the size of a handbag. There is also a chalkboard surface on the back so that you can finally scribble down your favorite ideas and memos on your musical instrument.
Scribbles has 2 ramp wave VCOs, 1 LFO, 1 Attack Release Envelope Generator, 1 Band Pass/ Low-Pass VCF, 1 Mixer, 1 Sample & Hold, and 1 VCA.

Scribbles plays a wide range of melodic pulses, space tones, drone, chirps, and noise-- There has been enough unpredictable musical material to keep us making new sounds since it was finished. The oscillators are tuned to 1V/octave, so it will track with other 1V/octave keyboards. There are inverting level shifteres on the ramp oscillators, and a sawtooth wave output on each. There is an additional square wave output on VCO 2. One of its special features is the pre-amp on the main output- you can listen to Scribbles on your headphones.

The mp3s are different sounds we made while experimenting with it. The first five mp3s are sounds that Scribbles makes as a stand-alone instrument, using patch cords. The last two mp3s are Scribbles patched with external drum machines' trigger and audio outputs. You can hear the self-oscillating filter, looping envelope patched with the LFO on the fourth demo.

 

With the Sample & Hold, you can play melodies that sound like a sequence and is especially fun to play with the LFO's triangle wave as its input source. With a square wave, the result is more calculated and more random sounding, depending on the pulse width and sample rate. The Attack-Release envelope generator has an internal loop option, which makes it repeat and play like an LFO too. If you switch the loop switch down, the envelope generator repeats on the Sample & Hold. The blue arcade button on the corner is a manual trigger button for the envelope generator. Adding to the main output's pre-amp, there is another pre-amp on the audio input, which turns up the volume but can also make distortion. And to add to this mix of making a variety in tones, there is another pre-amp circuit after the filter, but before the VCA.

This circuit is based on a design by Ray Wilson. Visit http://www.musicfromouterspace.com for other exciting analog projects and PC boards.