BASTL Instruments
Trinity POLY Synth

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Item: N13-2761

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Trinity POLY Synth
Trinity POLY Synth Trinity POLY Synth Trinity POLY Synth


Trinity is universal musical instrument and original sounding modular groovebox. It can function as any type of digital synthesizer, sequencer, controller, arpeggiator or almost anything that can be programmed into a micro-controller. Trinity is designed to be connected and combined with other Trinities of different functions in a chain, so you can create your own music making environment. It is ready to communicate with the outer world via MIDI and different sync and CV methods using MIDI Bastl. We are musicians passionate of exploring new fields of sonic experience – we already developed 4 different instruments for Trinity which work great together. They are sequencer, drum synthesizer, polyphonic synthesizer and monophonic FM synthesizer.…and there are many more to come!

Making a Chain

Communication: SQNCR is able to sequence 3 different Trinity instruments by MIDI protocol which is ideal for live sequencing. All instruments have MIDI input which reads note and CC values.(We plan to make CC automation sequencer and sensor boards sending CC.)

Audio: The chain connectors also share audio line which simply works as a passive mixer so all instruments can be mixed directly on Trinities themselves by the volume knobs and audio can be taken out by the rightmost jack. You can also take the audio from each device separately.

Power: The chain also shares the power so you need just one power adaptor to power the whole system. The Instruments can be powered from batteries in the chain as well.


  • Subtractive or FM synthesis mode
  • 3 voice polyphony
  • 6 different sound for each preset
  • 6 presets
  • In subtractive mode: oscillator + state variable filter with cutoff and resonance ( LP,HP,BP,notch )
  • In FM mode: oscillator + modulation oscillator with selectable wavetables
  • LFO with adjustable rate, resolution, amount, destination on different parameters and 8 different shapes
  • ADSR with impact on volume and adjustable impact to other parameters
  • Precise setting of oscillator, LFO and ADSR features are accessed by adjusting character knob which goes thru all possible settings of routing and wavetables
  • Exchange sounds between more Poly Synths by SysEx message
  • 4 wavetables (sine, saw, distorted square, noise)
  • 3 note playback by MIDI – velocity sensitive
  • Multi-timbral MIDI mode (lowest octave)
  • MIDI native by side connectors, note & velocity sensitive, CC support, thru
  • MIDI connector by connecting MIDI Bastl by the side

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  • Open-source, DIY, handmade, hackable, repairable
  • Bastl library with all source codes – gitHub
  • Atmega 328 chip reprogrammable by Arduino IDE (Arduino Uno compatible bootloader)
  • Runs Mozzi library in HI-FI mode
  • Midi implementation chart (you are able to add comments)

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