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Synth Overview

The Cosmo PD-101 is a phase distortion (PD) synthesizer inspired by the Casio CZ series. It generates sound by warping the phase of an oscillator before sampling a base waveform.

Signal Flow

Signal Flow Diagram
MIDI Input | v Modulation Sources (LFO 1, LFO 2, Random S&H, ADSR Mod Env, Velocity, Mod Wheel, Aftertouch) | v Modulation Matrix (11 sources -> 195+ destinations, each with depth) | v Voice (x8 polyphony) Line 1 (DCO Env -> Algorithm + DCW Env -> Base Wave -> DCA Env) Line 2 (same structure) | v Line Mixer (Normal / Ring Mod / Noise / L1 / L2 / L1+L1' / L1+L2') | v Output Stage: Volume + Mod -> FX Chain (6 slots) -> Soft Clip (tanh) -> Audio Out

Phase Distortion -- How It Works

Normal: Phase -> Wavetable -> Output PD: Phase -> [WARP ALGORITHM] -> Wavetable -> Output

The warp algorithm reshapes the phase curve, changing the harmonic content in real time.

The Two Oscillator Lines

Each line has its own algorithm, three 8-step envelopes (DCO/DCW/DCA), independent pitch/detune/octave, and base waveform selector.

Key Concepts

Term Meaning
DCO Digitally Controlled Oscillator -- pitch/frequency
DCW Digitally Controlled Waveshaper -- warp amount
DCA Digitally Controlled Amplifier -- amplitude
Algorithm The mathematical function that warps the phase
Envelope An 8-step step-function controlling a parameter over time
Modulation Matrix Routes any of 11 sources to any of 195+ destinations
FX Chain 6 serial effect slots processing the final audio

Next: Oscillators | Algorithms | Envelopes

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