;Written by Iain McCurdy, 2006

;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


;my flags on Ubuntu: -iadc -odac -b1024 -B2048 -+rtaudio=alsa -+rtmidi=null -m0
<CsoundSynthesizer>
<CsOptions>

</CsOptions>
<CsInstruments>
sr 		= 44100	;SAMPLE RATE
ksmps 	= 100	;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

gisine 		ftgen 	0, 0, 131072, 10, 1						;SINE WAVE FUNCTION TABLE
;TABLES FOR EXP SLIDER
giExp19000	ftgen	0, 0, 129, -25, 0, 20.0, 128, 19000.0
giExp20000	ftgen	0, 0, 129, -25, 0, 20.0, 128, 20000.0


instr	1	;GUI
	ktrig	metro	10
	if (ktrig == 1)	then
		kfco			invalue 	"Filter_Cutoff"
		gkfco		tablei	kfco, giExp19000, 1
					outvalue	"Filter_Cutoff_Value", gkfco
		gkres		invalue 	"Resonance"
		gkdist		invalue 	"Distortion"
		kfrq			invalue 	"Oscillator_Frequency"
		gkfrq		tablei	kfrq, giExp20000, 1
					outvalue	"Oscillator_Frequency_Value", gkfrq
		gkgain		invalue 	"Output_Amplitude_Scaling"
	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	
	kfrq			portk	gkfrq, kporttime									;SMOOTH MOVEMENT OF SLIDER VARIABLE
	kfco			portk	gkfco, kporttime									;SMOOTH MOVEMENT OF SLIDER VARIABLE
	asig			vco	 	1, kfrq, 1, 0, gisine								;GENERATE A TRIANGLE WAVE AUDIO SIGNAL (NOTE THAT lpf18 EXPECTS A SIGNAL WITHIN THE RANGE -1 TO 1)
	ares 		lpf18 	asig,  kfco, gkres, gkdist
				outs		ares  * gkgain, ares * gkgain							;FILTER OUTPUT IS SENT TO THE AUDIO OUTPUTS AND RESCALED USING gkgain SLIDER VARIABLE
endin
</CsInstruments>
<CsScore>
;INSTR | START | DURATION
i 1		0	   3600		;GUI
</CsScore>
</CsoundSynthesizer>
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 <label>Widgets</label>
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  <label>---------------------------------------------------------------------------------------------
lpf18 is a implementation of a 3-pole resonant low-pass filter. The '18' refers to the statistic that states that amplitude drops off at 18 decibels per octave beyond the cutoff frequency. The opcode's input arguments include cutoff frequency, resonance and distortion. Use of resonance and distortion can cause an increase in amplitude. To accomodate this phenomenon this example includes a control to scale down the output amplitude. An alternative approach would be to make use of the balance opcode to dynamically control the output signal. The input signal used in this example is a sawtooth waveform, the frequency of which is adjustable using an on-screen slider.</label>
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