From 9db4d2f2b414b7fcba5fe164fc37e1bfa3f82f54 Mon Sep 17 00:00:00 2001
From: Alberto Venturini <aventurini@gmail.com>
Date: Mon, 2 Apr 2018 06:54:46 +0200
Subject: [PATCH] Additive fun

---
 additive-fun.scd | 205 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 205 insertions(+)
 create mode 100644 additive-fun.scd

diff --git a/additive-fun.scd b/additive-fun.scd
new file mode 100644
index 0000000..f255b1c
--- /dev/null
+++ b/additive-fun.scd
@@ -0,0 +1,205 @@
+(
+s.meter;
+s.freqscope;
+s.plotTree;
+)
+
+///////////////////////////////////////////////////////////////////////////
+// Busses
+(
+~g0 = Group.new(s); // g0 = main synth group
+~g1 = Group.after(~g0); // g1 = effect group
+
+~b0 = Bus.audio(s);
+~b1 = Bus.audio(s);
+
+~c0 = Bus.control(s);
+~c0.set(100);
+
+~c1 = Bus.control(s);
+~c1.set(0);
+
+~c2 = Bus.control(s);
+~c2.set(1);
+)
+
+l = [1,2,3]
+l.add(4)
+l
+
+max(3,4)
+
+cos(0)
+
+///////////////////////////////////////////////////////////////////////////
+// Main synth
+//
+(
+
+SynthDef.new(\synth, {
+    arg freq = 440, outbus = 0, gate = 1, amp = 0.001;
+    var sig = 0, env,
+    tot = 70, // how many oscillators will be summed
+    freqstep = 0.99, // frequency multiplication factor
+    ampmod; // amplitude modulation osc
+
+    // Here we create segments that are used to shape the frequency spectrum.
+    //var segments = [[\lin, 0, 0.2, 0.1, 1], [\exp, 0.2, 0.7, 1, 0.5], [\lin, 0.7, 1, 0.5, 0.01]];
+    //var segments = [[\exp, 0, 0.2, 1, 0.01], [\exp, 0.2, 0.5, 0.001, 2], [\lin, 0.5, 1, 0.4, 0.01]];
+
+    var segments = [[\exp, 0, 1, 1, 0.01]];
+    //var segments = [[\lin, 0, 1, 1, 0.01]];
+
+    //var segments = [ [\exp, 0, 0.3, 1, 0.1], [\lin, 0.3, 0.6, 0.1, 0.8], [\exp, 0.6, 1.0, 0.8, 0.001] ];
+
+    var freqmul = { |i|
+        // 'i' is the index of the oscillator whose frequency we'll modulate.
+
+        // Normalized value of 'i'
+        var norm = i/tot;
+
+        // Choose the segment we're in for this 'i'
+        var segment = segments.select({ |int| (norm >=  int[1]) && (norm < int[2]) })[0];
+
+        if(segments != nil, {
+            var symbol = segment[0];
+
+            var start = 0;
+            var end = segment[2] - segment[1];
+            var valuestart = segment[3];
+            var valueend = segment[4];
+
+            // Find out where we are within the given segment
+            var position = norm.linlin(0, 1, start, end);
+
+            if(symbol == \lin, {
+                // linearly go from start to end
+                position.linlin(start, end, valuestart, valueend);
+            }, {
+                // exponentially go from start to end
+                position.linexp(start, end, valuestart, valueend);
+            });
+
+        });
+    };
+
+    var freqmul2 = { |i|
+        var norm = i/tot;
+
+        //1 - sin(norm);
+        norm.linexp(0, 1, 1, 0.0001);
+    };
+
+    ampmod = SinOsc.kr(3).linlin(-1, 1, 0.95, 1.05);
+
+    tot.do { |i|
+        sig = sig + LFTri.ar(
+            freq * (i*freqstep + 1) * rrand(0.995, 1.005),
+            mul: freqmul2.value(i)
+        );
+    };
+
+    env = EnvGen.kr(Env.adsr(0.001), gate, doneAction: 2);
+
+    sig = sig * env * amp * 0.3 * ampmod;
+    sig = LPF.ar(sig, In.kr(~c0).linlin(0, 127, 200, 18000));
+    sig = LPF.ar(sig, EnvGen.kr(Env.new([220, 18000], [0.01])));
+
+    Out.ar(outbus, sig!2);
+
+
+}).add;
+)
+
+
+///////////////////////////////////////////////////////////////////////////
+// FX synth - reverb
+(
+SynthDef.new(\reverb, {
+    arg inbus, outbus;
+
+    Out.ar(outbus, JPverb.ar(in: In.ar(inbus), size: 0.5));
+}).add;
+)
+
+(
+r = Synth.new(\reverb, [
+    \inbus, ~b0,
+    \outbus, 0
+], target: ~g1);
+)
+
+r.free;
+
+
+///////////////////////////////////////////////////////////////////////////
+// MIDI init
+(
+MIDIClient.init;
+MIDIIn.connectAll;
+)
+
+///////////////////////////////////////////////////////////////////////////
+// MIDI defs
+(
+var notes = Array.newClear(128);
+
+MIDIdef.noteOn(\noteOn, {
+    arg vel, nn, chan, src;
+    [vel, nn, chan, src].postln;
+    notes[nn] = Synth.new(\synth, [
+        \freq, nn.midicps,
+        \gate, 1,
+        \outbus, ~b0,
+        \ffreqBus, ~c0,
+        \rqBus, ~c1,
+        \amp, 0.1
+    ], ~g0);
+});
+
+MIDIdef.noteOff(\noteOff, {
+    arg vel, nn;
+    [vel, nn].postln;
+    notes[nn].set(\gate, 0);
+    notes[nn] = nil;
+});
+
+MIDIdef.cc(\modwheel, {
+    arg val, num, chan, src;
+    [val, num, chan, src].postln;
+
+    // 1 is the modulation wheel
+    if(num == 1, {
+        ~c0.set(val);
+    });
+
+    // 7 is the volume
+    if(num == 7, {
+        ~c1.set(val);
+    });
+});
+)
+
+///////////////////////////////////////////////////////////////////////////
+// MIDI cleanup
+(
+MIDIdef.freeAll;
+)
+
+
+
+(
+var notes = [52, 55, 60, 64, 67, 71, 72, 71, 67, 64 ];
+Pdef(\pattern,
+    Pbind(
+        \instrument, \synth,
+        \midinote, Prand(notes.collect({ |n| n - 12 }), inf),
+        \amp, Pexprand(0.05, 0.2, inf),
+        \sustain, Pexprand(0.05, 0.5, inf),
+        \dur, 0.2,
+        \outbus, ~b0
+    )
+).play;
+)
+
+Pdef(\pattern).stop;