; instrument algorithm ccsamptrem -- sampler with tremolo

gktest init 0
	instr	1
inum	notnum
ifno	table	inum, 99	;keyboard mapping to gen1 ftables 

ibasno	table	ifno, 98        ; returns midi notes of the sonudfile samples
ibasoct	=	ibasno/12. + 3.

icps	cpsmidi   ; needed only for CHAN options
kcps	cpsmidib 2  ; pitch with +/- 2 semitone bend from pitch bend wheel

;  ====== MIDI continuous controllers on MCS2:  ========================
    ;mod wheel =   controller 01 ; controls init. phase of trem. osc.
     ; Foot controllers Sliders:
     ; fc2       =   controller # 07    Amplitude (volume)
     ; fc1       =   controller # 04    Not used
     ; Continuous Sliders:
     ; cs1       =   controller # 06    Tremolo depth
     ; cs2       =   controller # 05    Tremolo rate
      
gktest =  gktest + 1    ; test to see if more than one note is playing on this MIDI
                        ; channel, so that these global variables are not recomputed
                        ; unnecessarily
if gktest > 1 kgoto gotcontrollers

       ; fc2 {foot controller 2} controls global AMPLITUDE {"volume"}
  gkfc2    midic7 7, 0, 1  ; foot controller # 2 = midi controller 07 {"volume"}
; "No Legal Opcode error   gkfc2    kpow  gkfc2, 2, 1    ; convert linear to exponential
  gkfc2 = sqrt(gkfc2)

; TREMOLO : time varying depth & rate
         ; continuous sliders 1 & 2 on MCS2 :
   gkcs1  midic7 8, 0, 1.  ; continuous slider 1 = midi controller # 8
                               ; tremolo depth
   gkcs2  midic7 5, 0 , 16.  ; continuous slider 2 = midi controller # 5
                                 ; tremolo rate 0 - 16.
   gkcs2    port  gkcs2, .01   ; smooth out abrupt changes in this controller
  ; starting phase of tremolo oscillator
   iphase  imidic7 1, 0, 1  ;
 if iphase < .96 igoto gotcontrollers
     iphase = rnd(1.) ; if mod wheel all the way up, random phase

gotcontrollers:

ktrem    oscil .5 * gkcs1, gkcs2 , 100, iphase    ; sine wave tremolo LFO
ktrem  = ktrem + .5       ; rescale output to 0 - 1.
;   ===========  end of MCS2 continuous controller inputs =======================

iatt  =  0  ; default no fade-in to soundfile, modified only for "legato" (left
            ; Clavinola pedal down

; ====== Clavinola pedals, used as 3 foot switches : ===============================
    ; Clavinla RIGHT pedal, MIDI ctrl #  64 (continuous but very poor resolution)
    ; used as a sustain pedal :
isust  midictrl  64
idecay = (isust = 0 ? .2 : .4 * isust )  ; "fade-out" time after key released
iatdec  =  .02

   ; Clavinola left and middle pedals
   ; Left pedal (ctrl # 66) creates staccato, CENTER pedal (ctrl # 67) creates legato
    ;  these 2 controllers are NOT continuous -- they are inits (either off or on)
ileftped    imidic7 67, 0, 1.
imidped    imidic7 66, 0, 1.

if imidped > .5 igoto legato  ; if middle ped down, legato articulation
if ileftped > .5 igoto staccato  ; if left ped down, staccato articulation
   igoto gotartic

legato:    ; MIDDLE pedal down
   ; if both left & middle pedals are down, use default normal articulation values
if imidped > .5 igoto gotartic 
      iatt    ampmidi  .5
      iatt  =  .5 - iatt
      iatt  = (iatt < .15 ? 0 : 2.2  * iatt)
      idecay  = 1.3 * idecay
      iatdec  =  .04
      igoto gotartic
staccato:   ; LEFT pedal down
      idecay  = .4 * idecay
      iatdec  =  .005
      igoto gotartic
gotartic:
;  ======= end of Clavinola foot pedal switch controller input ================

iamp	ampmidi	1, 97        ; max amp & non-linear scaling in f97
kamp	linenr	iamp, iatt , idecay , .02

kamp2   port  gkfc2, .08  ; smooth out abrupt changes in this controller`
a1	loscil	kamp * kamp2, kcps , ifno, cpsoct(ibasoct)
a1   =  (1. - gkcs1) * a1 + (ktrem * a1)
