TUNINGCUT OFF FREQRESONANCEENV MODDECAYACCENTTEMPOVOLUMETRACK · PATT. GROUPMODEWRITE · PLAY TRACKPLAY · WRITE PATTERNBass LineTB-303Computer ControlledSLOW FASTPOWER OFF MAXMIX INWAVEFORMSYNC INCVGATEHEADPHONEOUTPUTDC 9VCDEFGABCC#D#F#G#A#RANDOMSHIFT · KNOBS TOOD.C. BAR RESETPATTERN CLEARRUN/STOPPITCH MODEFUNCTIONNORMAL MODETIME MODETRANSPOSEDOWNUPACCENTSLIDED.SWRITE/NEXTTAPPATTERNSELECTOR1122334455667788OscillatorFilterFilter EnvelopeClockSequencerMixer
  • Pcenter
  • Dragturn
  • ⇧Dragpan
  • Scrollzoom
  • Spacesound
  • Rrandom
All shortcuts
  • Spacesound
  • Rrandom
  • ⇧R+ knobs
  • ⇧Mmutate
  • Enterstart/stop
  • Oopen/close
  • 1–8stage
  • ⇧1–8pattern
  • ←→knob
  • Wwave
  • []turn
  • Paddrag to turn
  • +−zoom
  • Pcenter
  • 03/4 view
  • Ffull screen
  • ⇧Dragpan
Squelch
  1. 1·
  2. 2·
  3. 3·
  4. 4·
  5. 5·
  6. 6·
  7. 7·
  8. 8·
  9. 9·
  10. 10·
  11. 11·
  12. 12·
  13. 13·
  14. 14·
  15. 15·
  16. 16·
Notes
Feel
MemorySlots keep what you make. On the panel: ⇧1–8.

How it works

What you hear

Try it

On the board

The selected stage and the knobs that control itThe audio path, moving while the sequencer runsControl voltages: envelope, accent and gate linesA bass-line synthesizer modelled on the Roland TB-303 (1981), with its top panel lifted off. The board runs left to right in signal order: a 4-bit microcontroller plays the pattern from battery-backed memory, a resistor DAC turns each step into a pitch voltage, one sawtooth oscillator feeds the diode-ladder filter, two envelopes and the accent circuit shape the filter and the VCA, and an op-amp drives the jacks on the back. The board layout is simplified. The sound and the scope come from one small model of that signal chain, running in the page.