;Written by Iain McCurdy, 2006

;THE delay OPCODE IS PLACED IN A SEPARATE, ALWAYS ON, INSTRUMENT FROM THE SOURCE SOUND PRODUCING INSTRUMENT.
;THE IS A COMMONLY USED TECHNIQUE WITH TIME SMEARING OPCODES AND EFFECTS LIKE REVERBS AND DELAYS.

;ksmps MAY NEED TO BE LOW (AND kr THEREFORE HIGH) WHEN WORKING WITH SHORT DELAY TIMES DEFINED INITIALLY AT KRATE

;Modified for QuteCsound by René, September 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	= 32			;NUMBER OF AUDIO SAMPLES IN EACH CONTROL CYCLE
nchnls	= 2			;NUMBER OF CHANNELS (2=STEREO)
0dbfs	= 1			;MAXIMUM SOUND INTENSITY LEVEL REGARDLESS OF BIT DEPTH


giExp1		ftgen	0, 0, 129, -25, 0, 0.001, 128, 1.0		;TABLE FOR EXP SLIDER


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	10	;GUI
	ktrig	metro	10
	if (ktrig == 1)	then
		gkingain		invalue	"Live_Input_Gain"
		kdlt			invalue	"Delay_Time"
		gkdlt		tablei	kdlt, giExp1, 1
					outvalue	"Delay_Time_Value", gkdlt		;init 0.5
		gkmix		invalue	"Mix"						;init 0.5
		gkfeedamt		invalue	"Feedback_Ratio"				;init 0.7
		gkamp		invalue	"Output_Amplitude_Rescaling"		;init 0.7
		gkporttime	invalue 	"Portamento_Time"				;init 0.3
		gkinput		invalue	"Input"
	endif
endin

instr	1	;PLAYS FILE
	if	gkinput==0	then									;IF FILE INPUT IS SELECTED...
		Sfile		invalue	"_Browse1"
		gasigL, gasigR	FilePlay2	Sfile, 1, 0, 1					;GENERATE 2 AUDIO SIGNALS FROM A SOUND FILE (NOTE THE USE OF GLOBAL VARIABLES)		
	else													;OTHERWISE
		asigL, asigR	ins									;TAKE INPUT FROM COMPUTER'S AUDIO INPUT
		gasigL		=	asigL * gkingain					;SCALE USING 'Input Gain' SLIDER
		gasigR		=	asigR * gkingain					;SCALE USING 'Input Gain' SLIDER
	endif												;END OF CONDITIONAL BRANCHING
endin

instr 	2	;DELAY INSTRUMENT
	kporttime	linseg		0, .001, 1, 1, 1					;USE OF AN ENVELOPE VALUE THAT QUICKLY RAMPS UP FROM ZERO TO 1. THIS PREVENTS VARIABLES GLIDING TO THEIR REQUIRED VALUES EACH TIME THE INSTRUMENT IS STARTED.
	kporttime	=	kporttime * gkporttime						;SCALE PORTAMENTO FUNCTION WITH FLTK SLIDER VALUE
	kdlt		portk		gkdlt, kporttime					;PORTAMENTO IS APPLIED TO THE VARIABLE 'gkdlt'. A NEW VARIABLE 'kdlt' IS CREATED.
	adlt		interp		kdlt								;A NEW A-RATE VARIABLE 'adlt' IS CREATED BY INTERPOLATING THE K-RATE VARIABLE 'kdlt' 
	
	;;;LEFT CHANNEL DELAY;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
	abufferL	delayr	1									;CREATE A DELAY BUFFER OF 5 SECONDS DURATION (EQUIVALENT TO THE MAXIMUM DELAY TIME POSSIBLE USING THIS EXAMPLE)
	adelsigL 	deltap3	adlt									;TAP THE DELAY LINE AT gkdlt SECONDS
			delayw	gasigL + (adelsigL * gkfeedamt)			;WRITE AUDIO SOURCE AND FEEDBACK SIGNAL INTO THE BEGINNING OF THE BUFFER
	
	;;;RIGHT CHANNEL DELAY;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;	
	abufferR	delayr	1									;CREATE A DELAY BUFFER OF 5 SECONDS DURATION (EQUIVALENT TO THE MAXIMUM DELAY TIME POSSIBLE USING THIS EXAMPLE)
	adelsigR 	deltap3	adlt									;TAP THE DELAY LINE AT gkdlt SECONDS
			delayw	gasigR + (adelsigR * gkfeedamt)			;WRITE AUDIO SOURCE AND FEEDBACK SIGNAL INTO THE BEGINNING OF THE BUFFER
	
	aL		ntrpol	gasigL, adelsigL, gkmix
	aR		ntrpol	gasigR, adelsigR, gkmix

			outs		aL * gkamp, aR * gkamp					;CREATE A MIX BETWEEN THE WET AND THE DRY SIGNALS AT THE OUTPUT
			clear	gasigL, gasigR							;CLEAR THE GLOBAL AUDIO SEND VARIABLES
endin
</CsInstruments>
<CsScore>
;INSTR | START | DURATION
i 10		0		3600		;GUI
i  2      0         3600		;INSTRUMENT 2 PLAYS FOR ONE HOUR
</CsScore>
</CsoundSynthesizer>
<bsbPanel>
 <label>Widgets</label>
 <objectName/>
 <x>72</x>
 <y>179</y>
 <width>804</width>
 <height>488</height>
 <visible>true</visible>
 <uuid/>
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  <r>241</r>
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  <visible>true</visible>
  <midichan>0</midichan>
  <midicc>0</midicc>
  <label>Delay with feedback</label>
  <alignment>center</alignment>
  <font>Liberation Sans</font>
  <fontsize>18</fontsize>
  <precision>3</precision>
  <color>
   <r>0</r>
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  <type>event</type>
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  <stringvalue/>
  <text>   ON / OFF</text>
  <image>/</image>
  <eventLine>i 1 0 -1</eventLine>
  <latch>true</latch>
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  <label>---------------------------------------------------------------
This example adds a feedback loop. Some of the audio signal present at the delay tap is fed back into the input of the delay buffer.
The amount of signal fed back is controlled by the 'Feedback Ratio' slider. A value of zero represents 0% of the signal being fed back and a value of 1 represents 100% of the signal being fed value.
Negative values are also allowed and represent the signal being inverted as it is fed back.
The audible effect of this is most evident when working with very short delay times.
In this example the user can choose between a sound file as input or the computer's live input.
A gain control is provided to control the gain of the live input.</label>
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  <visible>true</visible>
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  <label>Delay Time (sec)</label>
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  <maximum>1.00000000</maximum>
  <value>0.47200000</value>
  <mode>lin</mode>
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  <resolution>-1.00000000</resolution>
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  <bsbDropdownItemList>
   <bsbDropdownItem>
    <name>Audio File</name>
    <value>0</value>
    <stringvalue/>
   </bsbDropdownItem>
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    <name> Live Input</name>
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    <stringvalue/>
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   <r>0</r>
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