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;;; Perry Cook's maraca from CMJ vol 21 no 3 (Fall 97) p 44
;;; translated from CLM's maraca.ins
(provide 'snd-maraca.scm)
(if (provided? 'snd)
(require snd-ws.scm)
(require sndlib-ws.scm))
(define two-pi (* 2 pi))
(define num-beans 64)
(definstrument (maraca beg dur (amp .1)
(sound-decay 0.95)
(system-decay 0.999)
(probability .0625)
(shell-freq 3200.0)
(shell-reso 0.96))
(let ((st (seconds->samples beg))
(nd (seconds->samples (+ beg dur)))
(temp 0.0)
(shake-energy 0.0)
(snd-level 0.0)
(input 0.0)
(stop 0)
(h20 (hz->radians 20.0))
(sndamp (/ amp 16384.0))
(srate4 (floor (/ *clm-srate* 4)))
(gain (/ (* (log num-beans 4.0) 40) num-beans))
(tz (make-two-pole 1.0 (* -2.0 shell-reso (cos (hz->radians shell-freq))) (* shell-reso shell-reso)))
(oz (make-one-zero 1.0 -1.0))
;; gourd resonance filter
)
(do ((i st (+ i srate4)))
((>= i nd))
(set! temp 0.0)
(set! stop (min nd (+ i srate4)))
(do ((k i (+ k 1)))
((= k stop))
(if (< temp two-pi)
(begin
;; shake over 50msec and add shake energy
(set! temp (+ temp h20))
(set! shake-energy (- (+ shake-energy 1.0) (cos temp)))))
(set! shake-energy (* shake-energy system-decay))
;; if collision, add energy
(if (< (random 1.0) probability)
(set! snd-level (+ snd-level (* gain shake-energy))))
;; actual sound is random
(set! input (mus-random snd-level))
;; compute exponential sound decay
(set! snd-level (* snd-level sound-decay))
;; gourd resonance filter calc
(outa k (* sndamp (one-zero oz (two-pole tz input))))))))
;;; maraca: (with-sound (:statistics #t :play #t) (maraca 0 5 .5))
;;; cabasa: (with-sound (:statistics #t :play #t) (maraca 0 5 .5 0.95 0.997 0.5 3000.0 0.7))
(definstrument (big-maraca beg dur (amp .1)
(sound-decay 0.95)
(system-decay 0.999)
(probability .0625)
(shell-freqs '(3200.0))
(shell-resos '(0.96))
(randiff .01)
(with-filters #t))
;; like maraca, but takes a list of resonances and includes low-pass filter (or no filter)
(let ((resn (length shell-freqs)))
(let ((st (seconds->samples beg))
(nd (seconds->samples (+ beg dur)))
(temp 0.0)
(shake-energy 0.0)
(snd-level 0.0)
(input 0.0)
(sum 0.0)
(last-sum 0.0)
(tzs (make-vector resn))
(h20 (hz->radians 20.0))
(stop 0)
(sndamp (/ amp (* 16384.0 resn)))
(srate4 (floor (/ *clm-srate* 4)))
(gain (/ (* (log num-beans 4) 40) num-beans))
(oz (make-one-zero (/ amp (* resn 16384.0)) (/ amp (* resn 16384.0)))))
;; we need to fixup Perry's frequency dithering amount since we're going through our mus-frequency method
(set! randiff (radians->hz randiff))
;; gourd resonance filters
(do ((i 0 (+ i 1)))
((= i resn))
(vector-set! tzs i (make-two-pole 1.0
(* -2.0 (shell-resos i) (cos (hz->radians (shell-freqs i))))
(* (shell-resos i) (shell-resos i)))))
(do ((i st (+ i srate4)))
((>= i nd))
(set! temp 0.0)
(set! stop (min nd (+ i srate4)))
(do ((k i (+ k 1)))
((= k stop))
(if (< temp two-pi)
(begin
;; shake over 50msec and add shake energy
(set! temp (+ temp h20))
(set! shake-energy (- (+ shake-energy 1.0) (cos temp)))))
(set! shake-energy (* shake-energy system-decay))
;; if collision, add energy
(if (< (random 1.0) probability)
(begin
(set! snd-level (+ snd-level (* gain shake-energy)))
;; randomize res freqs a bit
(do ((j 0 (+ j 1)))
((= j resn))
(set! (mus-frequency (vector-ref tzs j)) (+ (shell-freqs j) (mus-random randiff))))))
;; actual sound is random
(set! input (mus-random snd-level))
;; compute exponential sound decay
(set! snd-level (* snd-level sound-decay))
;; gourd resonance filter calcs
(set! last-sum sum)
(set! sum 0.0)
(do ((j 0 (+ j 1)))
((= j resn))
(set! sum (+ sum (two-pole (vector-ref tzs j) input))))
(outa k (if with-filters
(one-zero oz (- sum last-sum))
(* sndamp sum))))))))
;;; tambourine: (with-sound (:play #t :statistics #t) (big-maraca 0 1 .25 0.95 0.9985 .03125 '(2300 5600 8100) '(0.96 0.995 0.995) .01))
;;; sleighbells: (with-sound (:play #t :statistics #t) (big-maraca 0 2 .15 0.97 0.9994 0.03125 '(2500 5300 6500 8300 9800) '(0.999 0.999 0.999 0.999 0.999)))
;;; sekere: (with-sound (:play #t :statistics #t) (big-maraca 0 2 .5 0.96 0.999 .0625 '(5500) '(0.6)))
;;; windchimes: (with-sound (:play #t :statistics #t) (big-maraca 0 2 .5 0.99995 0.95 .001 '(2200 2800 3400) '(0.995 0.995 0.995) .01 #f))
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