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We tried exciting tube resonances (either real or synthetic)
with sine tones from a signal generator application.
(it's called ~cc/220/demo) Kinks in the hand-drawn
waveform create harmonics.
The difference between the hw2 tube script and a real tube is due to low-pass filtering in the tube feedback loop.
Sampling frequency range is constrained by the Nyquist rate (half the sampling rate).
- examples in /usr/ccrma/snd/cc/demo/demo-sounds/synthTutorials/audioSampling/
- sine.scm has a sweep procedure to produce frequencies in excess of the sampling rate
(load "bird.scm") ; copy this source file from /usr/ccrma/lisp/src/sndMake a new bird from a hand-edited montage of "official birds." Try some filter, reverb, etc. from the control panel. Then, record the name of the new bird using your voice and add the bird call to the recording. Save as ~/Library/Web/220a/birdcall.wav
(make-birds)
...now you have a managerie of birds in a sound file