55 lines
1.7 KiB
Scheme
55 lines
1.7 KiB
Scheme
;; (v-osc3 rate bufpos freq1 freq2 freq3)
|
|
|
|
;; Three variable wavetable oscillators.
|
|
|
|
;; A wavetable lookup oscillator which can be swept smoothly across
|
|
;; wavetables. All the wavetables must be allocated to the same
|
|
;; size. Fractional values of table will interpolate between two
|
|
;; adjacent tables. This unit generator contains three oscillators at
|
|
;; different frequencies, mixed together.
|
|
|
|
;; This oscillator requires a buffer to be filled with a wavetable
|
|
;; format signal. This preprocesses the Signal into a form which can
|
|
;; be used efficiently by the oscillator. The buffer size must be a
|
|
;; power of 2.
|
|
|
|
;; This can be acheived by creating a Buffer object and sending it one
|
|
;; of the "b_gen" messages ( sine1, sine2, sine3 ) with the wavetable
|
|
;; flag set to true.
|
|
|
|
;; Note about wavetables: Vosc3 requires the b_gen sine1 wavetable
|
|
;; flag to be ON.
|
|
|
|
;; Allocate and fill tables 0 to 7 with a generated list of harmonic
|
|
;; amplitudes.
|
|
|
|
(with-sc3
|
|
(lambda (fd)
|
|
(let* ((square
|
|
(lambda (a) (* a a)))
|
|
(nth
|
|
(lambda (i)
|
|
(async fd (b-alloc i 1024 1))
|
|
(let* ((n (expt (+ i 1) 2))
|
|
(a (map (lambda (j)
|
|
(square (/ (- n j) n)))
|
|
(enum-from-to 0 (- n 1)))))
|
|
(async fd (b-gen1 i "sine1" (cons 7 a)))))))
|
|
(for-each nth (enum-from-to 0 7)))))
|
|
|
|
;; oscillator at buffers 0 through 7.
|
|
|
|
(let ((p (mouse-x kr 0 7 0 0.1))
|
|
(f1 (mce2 240 241))
|
|
(f2 (mce2 240.27 241.1))
|
|
(f3 (mce2 240.43 239.71)))
|
|
(audition (out 0 (mul (v-osc3 ar p f1 f2 f3) 0.2))))
|
|
|
|
;; Reallocate buffers while oscillator is running.
|
|
|
|
(with-sc3
|
|
(lambda (fd)
|
|
(for-each
|
|
(lambda (i)
|
|
(async fd (b-gen1 i "sine1" (cons 7 (replicate-m 16 (random 0 1))))))
|
|
(enum-from-to 0 7))))
|