01.Apolo9

Apolo9 is a circuit-level model of an “organismic” synthesizer, the kind of experimental DIY instrument tinkerers build from logic chips and touch plates. Each of its eight voices is a CD4093 logic gate used as a Schmitt-trigger oscillator, integrated exactly between threshold crossings with the real timing capacitors. The envelopes are a transistor charging a capacitor through the player's skin, so how hard and how long you touch shapes the attack.

Everything leans on everything: the envelopes bend the pitch, the pairs frequency-modulate each other, the oscillators pull into lock through the shared power rail, and TOTAL FB turns the whole instrument into one feedback loop. The two PT2399 delay chips are simulated bit by bit, so long delays hiss and grind as they do on the hardware. It ships with nineteen presets and a red panic button.