FAQ - Ixox/preenfm3 GitHub Wiki

I'm looking for a DX7 emulation, should i build a preenfm3 ?

Short answer : No.

The preenfm can read DX7 file but the emulation is not great. The internal engine is very different.
Don't buy it if you're after a DX7 sound.
But if you're after a powerfull polyphonic FM synth with a flexible 12 rows modulation matrix and lots of LFO, a graphical display and a clear animated user interface : Go :)

Is the preenfm3 firmware open source ?

yes.

Is the preenfm3 open hardware ?

The main PCB is not. I need to sell PCBs to cover the expenses of all the prototypes i ordered for the preenfm3.
The control board is open hardware. So you can customize it adding new buttons, leds, encoders, pot etc...
I’ll also provide a version of the enclosure for 3D printing.

What are the differences with the preenfm2 ?

• More powerful MCU with more memory which allowed me to :

  • increase the number of voices to 16 with 6 operators FM
  • sample frequency is 48Khz vs 42Khz for the preenfm2.
  • The selected effect is now applied per voice and not for the full instrument
  • 6 independent instruments

• Unison mode (will be ported to the preenfm2 when i have free time).

• 240×320 pixels color TFT display for better UI and an oscilloscope.

• Midi filter and note shift per instrument.

• Scala scale per instrument.

• 3 dual channel 24 bits DAC to offer 6 independent audio outputs.

• Mixer section (Volume, pan, compressor per instrument)

• Sequencer section : real-time and step sequencer

• Flexible Global reverb coded by Patrice Vigouroux (Toltekradiation)

Why isn't <Add your feature here> supported ?

Let's discuss that on the forum.
But before, keep in mind that :

• i develop the preenfm3 during my free time
• the firmware is open source so everybody can contribute to it ;)