53 lines
1.4 KiB
Text
53 lines
1.4 KiB
Text
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#lang scribble/manual
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@(require (for-label racket))
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@title{(osc rate bufnum freq phase)}
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linear interpolating wavetable lookup oscillator with frequency and
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phase modulation inputs.
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This oscillator requires a buffer to be filled with a wavetable
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format signal. This preprocesses the Signal into a form which can
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be used efficiently by the oscillator. The buffer size must be a
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power of 2.
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This can be acheived by creating a Buffer object and sending it one
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of the "b_gen" messages ( sine1, sine2, sine3 ) with the wavetable
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flag set to true.
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Note about wavetables: oscN requires the b_gen sine1 wavetable flag
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to be OFF. osc requires the b_gen sine1 wavetable flag to be ON.
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(with-sc3
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(lambda (fd)
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(async fd (b-alloc 10 512 1))
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(async fd (b-gen1 10 "sine1" (list (+ 1 2 4) 1 1/2 1/3 1/4 1/5)))))
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(audition (out 0 (mul (osc ar 10 220 0) 0.1)))
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Modulate freq
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(let ((f (x-line kr 2000 200 1 remove-synth)))
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(audition (out 0 (mul (osc ar 10 f 0) 0.5))))
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Modulate freq
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(let* ((f1 (x-line kr 1 1000 9 remove-synth))
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(f2 (mul-add (osc ar 10 f1 0) 200 800)))
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(audition (out 0 (mul (osc ar 10 f2 0) 0.25))))
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Modulate phase
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(let* ((f (x-line kr 20 8000 10 remove-synth))
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(p (mul (osc ar 10 f 0) (* 2 pi))))
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(audition (out 0 (mul (osc ar 10 800 p) 0.25))))
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Change the buffer while its playing
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(audition (out 0 (mul (osc ar 10 220 0) 0.1)))
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(with-sc3
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(lambda (fd)
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(async fd (b-gen1 10 "sine1" (list (+ 1 2 4) 1 (random 0 1) 1/4)))))
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