Synths on a Rope

here and here
" VCOs
1 Attack-Release Envelope Generator
2 LFOs (1 is Voltage Controlled, based from the MOOG SOURCE LFO)
1 VCF (modified from the original Soundlab so that it is SELF OSCILLATING like the KORG MS-20 filter)
1 Mixer
1 VCA
1 White Noise"

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Soundlab Analog Modular Synth

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"Listen to mp3s and more pictures at www.healthclub-music.com/scribbles.htm

This is Health Club Music's Soundlab analog mini synthesizer. It has two VCOs, one LFO, one Attack-Release Envelope Generator, one Band Pass/ Low-Pass VCF (self-oscillates with resonance up), one Sample and Hold, one Mixer, and one VCA. It is patchable with patch cables so you can play it with many different analog synthesizers.

The two ramp VCOs have inverted level shifters and have both ramp and sawtooth outputs. VCO 2 has an additional square wave output and a pulse width knob. There is a Pulse Width Modulation input on VCO 2. There is a Sync switch which allows the two oscillators to sync. VCO 1 has a Mod input, which is the CVII jack. These oscillators are scaled to 1V/octave, so it will track a keyboard that is also 1V/octave like most Moog keyboards and Roland synths. They can play many octaves in itself.

The Attack Release Envelope Generator has a Loop switch which allows the Envelope to repeat on one of two sources. With the switch on internal repeat, it loops on the gate, and with the switch on the "down" position, it loops on the Sample and Hold's gate output. You have to have an input going to the Sample and Hold. With the AR internal repeat on, you can use the AR like an LFO.

The Sample and Hold has a portamento control, and an input and output jack. It sounds great with the LFO's triangle output plugged in, it sounds like a sequenced melody. The LFO's square wave output works when the wave shape switch is switched onto the center triangle position.

There is an audio input jack and a mixer knob for the audio input. There is a pre-amp on the audio input, so you can plug a guitar into it and can also be used for distortions. There is another pre-amp circuit after the filter and before the VCA. There is also another pre-amp on the main output, so you can listen to this synth on headphones.

Runs on 2 9V batteries.

There is also a chalkboard surface on the back of this synthesizer, so you can carry it by its rope handle and scribble down your ideas on the back with chalk. Some chalk is included, of course, in the red felt pouch beneath the battery holder.

The circuit on this synth is based on a design by Ray Wilson. Check out www.musicfromouterspace.com for more of his exciting analog projects and PC boards."