;Written by Iain McCurdy, 2006

;MAKE ADJUSTMENTS CAUTIOUSLY - VERY UNPLEASANT SOUNDS ARE POSSIBLE WITH THIS OPCODE - PROTECT YOUR EARS!

;Modified for QuteCsound by René, November 2010, updated Feb 2011
;Tested on Ubuntu 10.04 with csound-float 5.13.0 and QuteCsound svn rev 817

;Notes on modifications from original csd:
;	Add table(s) for exp slider
;	Add Browser for audio file and use of FilePlay2 udo, now accept mono or stereo wav files


;my flags on Ubuntu: -iadc -odac -b1024 -B2048 -+rtaudio=alsa -+rtmidi=null -m0
<CsoundSynthesizer>
<CsOptions>
--env:SSDIR+=../../SourceMaterials
</CsOptions>
<CsInstruments>
sr 		= 44100	;SAMPLE RATE
ksmps 	= 100	;NUMBER OF AUDIO SAMPLES IN EACH CONTROL CYCLE
nchnls	= 2		;NUMBER OF CHANNELS (2=STEREO)


;TABLES FOR EXP SLIDER
giExp1		ftgen	0, 0, 129, -25, 0, 0.001, 128, 1.0
giExp500		ftgen	0, 0, 129, -25, 0, 0.001, 128, 500.0
giExp5000		ftgen	0, 0, 129, -25, 0, 1.0, 128, 5000.0


opcode FilePlay2, aa, Skoo		; Credit to Joachim Heintz
	;gives stereo output regardless your soundfile is mono or stereo
	Sfil, kspeed, iskip, iloop	xin
	ichn		filenchnls	Sfil
	if ichn == 1 then
		aL		diskin2	Sfil, kspeed, iskip, iloop
		aR		=		aL
	else
		aL, aR	diskin2	Sfil, kspeed, iskip, iloop
	endif
		xout		aL, aR
endop


instr	1	;GUI

	Sfile_new			strcpy		""						;INIT TO EMPTY STRING

	ktrig	metro	10
	if (ktrig == 1)	then
		kcutoff		invalue 	"Filter_Cutoff"
		gkcutoff		tablei	kcutoff, giExp5000, 1
					outvalue	"Filter_Cutoff_Value", gkcutoff
		kresonance	invalue 	"Resonance"
		gkresonance	tablei	kresonance, giExp500, 1
					outvalue	"Resonance_Value", gkresonance
		kamp			invalue 	"Output_Amplitude_Scaling"
		gkamp		tablei	kamp, giExp1, 1
					outvalue	"Output_Amplitude_Scaling_Value", gkamp

		gknumlayer 	invalue  "Layers"
		gkskip		invalue	"Initialisation"

		gSfile		invalue	"_Browse"
		Sfile_old		strcpyk	Sfile_new
		Sfile_new		strcpyk	gSfile
		gkfile 		strcmpk	Sfile_new, Sfile_old
	endif
endin

instr	2
	kporttime		linseg	0,0.001,0.005,1,0.005										;CREATE A VARIABLE FUNCTION THAT RAPIDLY RAMPS UP TO A SET VALUE	
	kcutoff		portk	gkcutoff, kporttime											;SMOOTH MOVEMENT OF SLIDER VARIABLE

	kNew_file		changed	gkfile													;GENERATE A MOMENTARY '1' PULSE IN OUTPUT 'kSwitch' IF ANY OF THE SCANNED INPUT VARIABLES CHANGE. (OUTPUT 'kSwitch' IS NORMALLY ZERO)
	if	kNew_file=1	then															;IF I-RATE VARIABLE CHANGE TRIGGER IS '1'...
		reinit	NEW_FILE															;BEGIN A REINITIALISATION PASS FROM LABEL 'START'
	endif
	NEW_FILE:
	;OUTPUTS		OPCODE	FILE  | SPEED | INSKIP | LOOPING (0=OFF 1=ON)
	asigL, asigR	FilePlay2	gSfile,  1,      0,         1									;GENERATE 2 AUDIO SIGNALS FROM A STEREO SOUND FILE
				rireturn															;RETURN FROM REINITIALISATION PASS TO PERFORMANCE TIME PASSES

	kSwitch		changed	gkskip, gknumlayer											;GENERATE A MOMENTARY '1' PULSE IN OUTPUT 'kSwitch' IF ANY OF THE SCANNED INPUT VARIABLES CHANGE. (OUTPUT 'kSwitch' IS NORMALLY ZERO)
	if	kSwitch=1	then																;IF I-RATE VARIABLE CHANGE TRIGGER IS '1'...
		reinit	START															;BEGIN A REINITIALISATION PASS FROM LABEL 'START'
	endif
	START:
	aresL 		lowresx	asigL, kcutoff, gkresonance, i(gknumlayer), i(gkskip)				;FILTER EACH CHANNEL SEPARATELY
	aresR 		lowresx	asigR, kcutoff, gkresonance, i(gknumlayer), i(gkskip)				;FILTER EACH CHANNEL SEPARATELY

				rireturn															;RETURN FROM REINITIALISATION PASS TO PERFORMANCE TIME PASSES
				outs		aresL * gkamp, aresR * gkamp									;SEND FILTER OUTPUT TO THE AUDIO OUTPUTS AND SCALE USING THE FLTK SLIDER VARIABLE gkamp
endin
</CsInstruments>
<CsScore>
;INSTR | START | DURATION
i 1		0	   3600		;GUI
</CsScore>
</CsoundSynthesizer>

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  <label>lowresx</label>
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  <label>lowresx</label>
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  <label>------------------------------------------------------------------------------------------------------
lowresx is an implementation of a resonant low-pass filter. Its input arguments are for filter cutoff frequency, resonance, number of iterations of the filter (optional, default=4) and an optional 2-way switch (default=0) to select whether the data space for feedback within the filter is initially cleared or allowed to retain previously held information. Cutoff frequency is not in hertz and resonance is not in decibels so experimentation is recommended. Use of high levels of resonance can cause significant increases in the overall output amplitude. It may be desired to make use of the balance opcode to control these fluctuations in amplitude. Alternatively a control to scale the output amplitude can be implemented (as has been done in this example). lowresx is equivalent to multiple iterations of the lowres opcode connected in series. Extremely loud and piercing tones are possible with this opcode so use with care and protect your ears and speakers!</label>
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  <text>  ON / OFF</text>
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  <eventLine>i 2 0 -1</eventLine>
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  <fontsize>10</fontsize>
  <precision>3</precision>
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