schlappi-engineering-three-body

Schlappi Engineering Three Body

Triple FPGA oscillator for phase and frequency modulation

30 HP Eurorack module

Three Body is a phase- and frequency-modulation toolkit built around an FPGA core that brings digital DDS techniques to an analog interface. It contains three oscillators — a left, a center and a right — that can run fully independently or use a web of internal normalizations to behave as a stereo FM voice, drone bank or noise box. Each oscillator has three state switches (Free/Ratio, Exp/Lin, and Hi-Mult/Low-Div) defining one of 8 states, plus volts/octave, phase and frequency modulation inputs and sine/triangle/saw/square outputs. The center oscillator adds two phase-modulation index inputs and a second pair of phase-related outputs (cosine and cosaw) for wide stereo imaging. High internal sample rate (12.5MHz audio path, 36-bit accumulator) gives clean audio-rate modulation.

Features

  • Three independent oscillators (left, center, right)
  • FPGA core with 12.5MHz audio path and 36-bit accumulator
  • Phase and frequency (through-zero) modulation
  • Each oscillator: V/Oct, phase and FM inputs
  • Per-oscillator modulation index (VCA) CV inputs
  • Sine, triangle, saw and square outputs on every oscillator (16 total)
  • Center oscillator adds cosine and cosaw for stereo (phase-related pairs)
  • Free-running or ratio-tracking mode per oscillator
  • Exponential or linear through-zero FM per oscillator
  • CV-controllable frequency ratios
  • External tracking at a CV-controllable ratio via SYNC
  • Extensive internal normalization for instant stereo FM / drones

Controls & Jacks (54)

  • Left Coarse/Mult
  • Left Fine/Div
  • Left FM Index
  • Left Phase CV
  • Left Type
  • Left FM Mode
  • Left Range
  • Transpose In
  • Left V/Oct Ratio In
  • Center Coarse/Mult
  • Center Fine/Div
  • Phase 1 Index
  • Phase 2 Index
  • FM CV
  • Center Type
  • Center FM Mode
  • Center Range
  • Center V/Oct Ratio In
  • Right Coarse/Mult
  • Right Fine/Div
  • Right FM Index
  • Right Phase CV
  • Right Type
  • Right FM Mode
  • Right Range
  • Right V/Oct Ratio In
  • Left Phase In
  • Left FM In
  • Left FM Index In
  • Left Sync In
  • Center FM In
  • Phase 1 In
  • Phase 1 Index In
  • Phase 2 In
  • Phase 2 Index In
  • Center Sync In
  • Right Phase In
  • Right FM In
  • Right FM Index In
  • Right Sync In
  • Left Sine Out
  • Left Triangle Out
  • Left Saw Out
  • Left Square Out
  • Sine Out
  • Cosine Out
  • Triangle Out
  • Saw Out
  • Cosaw Out
  • Square Out
  • Right Sine Out
  • Right Triangle Out
  • Right Saw Out
  • Right Square Out

How-To Guides

  • Unmodulated harmonic ratios
  • Phase modulation with ratios (stereo)
  • Stereo linear FM
  • External pitch tracking
  • Clocked ratio bass

Explore the interactive Three Body panel on BleepDex — tap any control to learn what it does.

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