+
+declare name "organ -- a simple additive synth";
+declare author "Albert Graef";
+declare version "1.0";
+
+import("music.lib");
+
+// control variables
+
+vol = hslider("vol", 0.3, 0, 10, 0.01); // %
+pan = hslider("pan", 0.5, 0, 1, 0.01); // %
+attack = hslider("attack", 0.01, 0, 1, 0.001); // sec
+decay = hslider("decay", 0.3, 0, 1, 0.001); // sec
+sustain = hslider("sustain", 0.5, 0, 1, 0.01); // %
+release = hslider("release", 0.2, 0, 1, 0.001); // sec
+freq = nentry("freq", 440, 20, 20000, 1); // Hz
+gain = nentry("gain", 0.3, 0, 10, 0.01); // %
+gate = button("gate"); // 0/1
+
+// relative amplitudes of the different partials
+
+amp(1) = hslider("amp1", 1.0, 0, 3, 0.01);
+amp(2) = hslider("amp2", 0.5, 0, 3, 0.01);
+amp(3) = hslider("amp3", 0.25, 0, 3, 0.01);
+
+// additive synth: 3 sine oscillators with adsr envelop
+
+partial(i) = amp(i+1)*osc((i+1)*freq);
+
+process = sum(i, 3, partial(i))
+ * (gate : vgroup("1-adsr", adsr(attack, decay, sustain, release)))
+ * gain : vgroup("2-master", *(vol) : panner(pan));