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BASTL Instruments
Trinity MONO FM Synth

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Item: N13-2762

Availability: In stock

Trinity MONO FM Synth
Trinity MONO FM Synth Trinity MONO FM Synth Trinity MONO FM Synth


Mono FM is experimental monophonic FM synthesizer equipped with 1 oscillator, 3 modulators and LFO.

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!

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.


  • Experimental monophonic FM synthesizer
  • 8 different sound for each preset
  • 6 presets
  • 1 carrier oscillator with pitch tuned in semitones
  • 3 modulation oscillators with adjustable harmonic multiple of carrier frequency, detune and amount of modulation
  • 8 algorithms of oscillator configuration
  • 3 wavetables for all oscillators (sine, saw, white noise)
  • LFO with adjustable rate, resolution, amount, destination on different parameters and 8 different shapes
  • Exchange sounds between more Mono FM Synths by SysEx message
  • MIDI native by side connectors, note, 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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