OAK: the occam Audio Kit; Adam Sampson <ats@offog.org>
An emulation of various bits of electronic music equipment.

This is horrendously inefficient, but produces quite good results.
The current approach is to make everything synchronous: every device
produces output at the system sample rate.

To do:
- function for converting time to number of samples, then make echo etc. use
  it
- OSS input
- Dig out an FFT for filter effects
- Synthesise more waveforms
- Drums
- Sample playback and rate conversion