Fork Code: Detuned Synth Pad

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code content
/*
 A SuperCollider implementation of the synth sound described here:
 "http://www.attackmagazine.com/technique/synth-secrets/detuned-pad/"
*/

// Chord seq:
// 1. (E1, E2, B3, D4, G4)
// 2. (G1, G2, B3, D4, F#4, A4)
// 3. (G1, G2, B3, D4, F#4, A4, B4)
// 4. (A1, A2, C4, E4, G4)
// 5. (C1, C2, G3, E4, G4)

(
// sequence
~crdStr = [["E1", "E2", "B3", "D4", "G4"],
	["G1", "G2", "B3", "D4", "F#4", "A4"],
	["B4"],
	["A1", "A2", "C4", "E4", "G4"],
	["C1", "C2", "G3", "E4", "G4"]
];

// Map from chord names to midi notes
~noteToMidi = {
	arg noteStr;
	var notes = Dictionary[
	"C"  -> 0,
	"C#" -> 1,
	"D"  -> 2,
	"D#" -> 3,
	"E"  -> 4,
	"F"  -> 5,
	"F#" -> 6,
	"G"  -> 7,
	"G#" -> 8,
	"A"  -> 9,
	"A#" -> 10,
	"B"  -> 11];
	var octave = noteStr.last.digit;
	var degree = notes[noteStr[..noteStr.size-2].postln];
	octave*12 + degree;
};

~crdArray = ~crdStr.collect{
	arg crd;
	crd.collect{|c| ~noteToMidi.(c)};
};
)

// STEP 1: a simple synth
(
// Init synth
SynthDef(\simpSaw1, {|freq, gate=1|
	var env = EnvGen.ar(Env.adsr(0.01,0.3,0.5,0.1), gate, doneAction:2);
	var snd = Saw.ar(freq!2);
	Out.ar(0, env*snd);
}).add;
)

// Play chord seq
(
Pbind(
	\instrument, \simpSaw1,
	\freq, Pseq(~crdArray + 24, inf).midicps,
	\dur, 2.5*Pseq([1, 0.375, 0.625, 1, 1], 1),
	\sustain, 2.55*Pseq([1, 1, 0.625, 1, 1], 1)
).play;
)

// STEP2: add voices/detune/de-phase

(
SynthDef(\simpSaw2, {|freq, gate=1|
	var adsr = EnvGen.ar(Env.adsr(0.25,0.01,0.75,0.25), gate, doneAction:2);
	var nvoices1 = 5, nvoices2 = 7;
	var detune1 = 10, detune2 = 5;

	var osc1 = {
		var m = 2**(detune1/1200).rand2;
		var saw = LFSaw.ar(m * freq/2);
		DelayC.ar(saw, 0.02, freq.reciprocal.rand);
	}.dup(nvoices1);

	var osc2 = {
		var m = 2**(detune2/1200).rand2;
		var saw = LFSaw.ar(m * freq);
		DelayC.ar(saw, 0.02, freq.reciprocal.rand);
	}.dup(nvoices2);

	Out.ar(0, Splay.ar(osc1 + osc2 * adsr)/4);
}).add;
)

// Play chord seq
(
Pbind(
	\instrument, \simpSaw2,
	\freq, Pseq(~crdArray+24, inf).midicps,
	\dur, 2.5*Pseq([1, 0.375, 0.625, 1, 1], 1),
	\sustain, 2.5*Pseq([1, 1, 0.625, 1, 1], 1)
).play;
)


// STEP3: add LFO
(
SynthDef(\simpSaw3, {|freq, gate=1|
	var adsr = EnvGen.ar(Env.adsr(0.25,0.01,0.75,0.25), gate, doneAction:2);
	var nvoices1 = 5, nvoices2 = 7;
	var detune1 = 10, detune2 = 5;

	var osc1 = {
		var m = 2**(detune1/1200).rand2;
		var lfo = SinOsc.ar(3.rand).range(0,1);
		DelayC.ar(Saw.ar(m * freq/2), 0.02, freq.reciprocal.rand * lfo);
	}.dup(nvoices1);

	var osc2 = {
		var m = 2**(detune2/1200).rand2;
		var lfo = SinOsc.ar(3.rand).range(0,1);
		DelayC.ar(Saw.ar(m * freq), 0.02, freq.reciprocal.rand * lfo);
	}.dup(nvoices2);

	Out.ar(0, Splay.ar(osc1 + osc2 * adsr)/4);
}).add;
)

// Play chord seq
(
Pbind(
	\instrument, \simpSaw3,
	\freq, Pseq(~crdArray+24, inf).midicps,
	\dur, 2.5*Pseq([1, 0.375, 0.625, 1, 1], 1),
	\sustain, 2.5*Pseq([1, 1, 0.625, 1, 1], 1)
).play;
)

// STEP4: add filter
(
SynthDef(\simpSaw4, {|freq, gate=1|
	var adsr = EnvGen.ar(Env.adsr(1e-8,1e-6,0.75,0.125), gate, doneAction:2);
	var nvoices1 = 5, nvoices2 = 7;
	var detune1 = 12, detune2 = 8;

	var osc1 = {
		var m = 2**(detune1/1200).rand2;
		var lfo = SinOsc.ar(3.rand).range(0,1);
		DelayC.ar(LFSaw.ar(m * freq/2), 0.02, freq.reciprocal.rand * lfo);
	}.dup(nvoices1);

	var osc2 = {
		var m = 2**(detune2/1200).rand2;
		var lfo = SinOsc.ar(3.rand).range(0,1);
		DelayC.ar(LFSaw.ar(m * freq), 0.02, freq.reciprocal.rand * lfo);
	}.dup(nvoices2);

	var snd = BLowPass4.ar(osc1, 800, 0.5) + osc2 / 4;
	Out.ar(0, Splay.ar(snd*adsr));
}).add;
)

// Play chord seq
(
Pbind(
	\instrument, \simpSaw4,
	\freq, Pseq(~crdArray+24, inf).midicps,
	\dur, 2.5*Pseq([1, 0.375, 0.625, 1, 1], 1),
	\sustain, 2.5*Pseq([1, 1, 0.625, 1, 1], 1)
).play(quant: 1);
)

// Now Let's hear each version one at a time:
(
{
	~list = [\simpSaw1, \simpSaw2, \simpSaw3, \simpSaw4];
	4.do{
		arg i;
		Pbind(
			\instrument, ~list[i],
			\freq, Pseq(~crdArray+24, inf).midicps,
			\dur, 2.5*Pseq([1, 0.375, 0.625, 1, 1], 1),
			\sustain, 2.5*Pseq([1, 1, 0.625, 1, 1], 1)
		).play(quant: 1);
		(2.5*[1, 0.375, 0.625, 1, 1].sum + 0.125).wait;
	};
}.fork;
)
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