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Synths

Synth code lives mainly in toern_synths.ino, with graph nodes in audioinit.h and defaults/presets in toern_parameters.ino.

Channel 11 — poly​

  • Up to POLY_VOICES (3) simultaneous voices
  • Multi-oscillator stacks per voice (Swaveform*, mixers, ladder filters, envelopes)
  • Instrument presets: BASS, KEYS, CHPT, PAD, WOW, ORG, FLT, LEAD, ARP, BRSS
  • Preset application: applySynthInstrumentPreset / *_synth(...) helpers

Channels 13–14 — mono​

  • Dual oscillators each (waveform13_*, waveform14_*)
  • ADSR, LFO, arpeggiator parameters in synth/filter setting tables
  • Share the crush → filter → reverb pattern with other instruments

Voice lifecycle​

FunctionRole
playSound(note, ch)Start a voice for a sequencer/MIDI note
stopSound(note, ch)Release / stop
updateSynthVoice(ch)Push current settings into Audio objects
switchSynthVoice(...)Change instrument type with parameter bundle
autoOffActiveNotes()Housekeeping for hanging voices

Voice timing/state arrays (voiceStartTime, sustain levels, resonance, …) sit at the top of toern_synths.ino.

Interaction with FX​

Bitcrush / filter / reverb for synth channels are the same conceptual FX slots as samples, applied through setFilters / mixer gain helpers so UI sliders stay consistent across channel types.