;;;
;;; A ring modulation instrument with wavetables
;;; (nando, Oct 14 '96)

(definstrument rmw (start-time duration carrier-freq modulator-freq amplitude
		   &key
		   (carrier-spectr '(1 0.5 2 0.2 5 0.1))
		   (modulator-spectr '(1 0.5 3 0.2 4 0.1))
		   (amp-env '(0 0 0.5 1 1 0)))
  (multiple-value-bind (beg end) (get-beg-end start-time duration)
    (let* ((wave-c (load-synthesis-table carrier-spectr (make-table)))
           (carrier (make-table-lookup :frequency carrier-freq :wave-table wave-c))
	   (wave-m (load-synthesis-table modulator-spectr (make-table)))
           (modulator (make-table-lookup :frequency modulator-freq :wave-table wave-m))
	   (envelope (make-env :envelope amp-env 
			       :scaler amplitude
			       :start-time start-time 
			       :duration duration)))
      (Run
       (loop for i from beg to end do
	     (outa i (* (env envelope)
			(* (table-lookup carrier)(table-lookup modulator)))))))))

;;; very slow tremolo
;;; (with-sound()(rm 0 4 440 0.5 0.1))

;;; from tremolo to spectrum

;;; (with-sound() (loop for time from 0 by 1.1 
;;;		    for f from 10 by 10 below 150 
;;;		    with ae = '(0 0 0.1 1 0.9 1 1 0) do
;;;		    (rm time 1.2 440 f 0.1 :amp-env ae)))