Modular Synth Simulator

Usage: ./synth.sh <synthesis-program.scm> <outfile.wav> ./play.sh <synthesis-program.scm>

Dependencies:

• Gambit Scheme (for synthesis)
• Python + Scipy (for encoding, didn't bother writing a wav encoder)

To synthesize: Synthesis is described as Scheme programs. load' the sequencer, then use its functions to describe what you want to synthesize, and call signal->wavfile' on the result. The examples in the `examples' subdirectory may help.

Features:

• Sine waves
• Additive synthesis (the `weighted-harmonics' function)
• Square waves
• Sawtooth waves
• Sequencing
• Scale and arpeggio generation
• Chords
• Drum machine
• Multi-track (the `dub' function)

This is meant to be modular, so other modules should be easy to add. Ideas:

• "Voltage" Controlled Filters (VCFs)
• ADSR envelopes

WARNING Sampling rate oddities may happen. I blame scipy.

CAVEAT This is nowhere near real time. No effort whatsoever went into optimizing anything at all. In fact, some decisions were pretty dumb performance-wise. Switching from lists to, say, ropes to represent signals would probably be a huge improvement. Patches welcome.