Reader Xavier Hosxe sends word about a new DIY synth project, preenFM.
preenFM is an open source and open hardware project that lets you build a hardware FM synth module.
- 9 different FM algorithms with up to 6 operators
- Each operator includes a pair of oscillator and ADSR envelope
- Oscillator : 7 waveforms (4 sin variation + noise + square + sawtooth), linked to keyb freq or fix, fine tune
- Up to 4 voice polyphony with 3 operators FM algorithm, up to 3 voice polyphony with 4 operators FM algorithm and up to 2 with 6 operators FM algorithm.
- Glide available when voice set to 1
- 3 standard LFOs (4 waveforms (saw, ramp, square, random), frequency in Hz, ramp up to 4 seconds, reset on new note).
- 1 Env type LFO
- 8 rows modulation matrix – 12 different sources and 24 destinations
- 4 banks of 128 user presets
- System exclusive to exchange patches and banks with a computer
- Midi control : 44 control input/output control changes linked to parameters
- Nrpn : input/ouput of all paremeters
- Midi channel selectable : Midi for other channges can be forwarded to plug several PreenFM in serial
- Large readable 4×20 LCD
- Friendly surface controle : You always clearly see on the screen what you’re currently editing
- Sampling rate : 32768 Hz (Makes integer division faster). Pseudo 11 bits.
- 1024 Hz for LFO and modulation matrix
- 6th order butterworth analog filter to convert the 1 bit output into a nice waveform
- Transparent case that allows you to see every day your nice work
preenFM is going to be made available in limited quanities in mid-December. Hosxe says that there will be a batch of 20 kits, priced at 130 euros + shipping for the full kit.
See the preenFM site for details.