I haven’t built one yet, but this is getting more and more interesting!
The French DIY FM synth PreenFM is getting a nice upgrade for the next release in september/october 2013.
More info at the PreenFM Facebook page
here’s a what’s new:
What’s new in the firmware ?
. Stereo (per carrier operator)
. Multitimbral * 4
. 8 to 16 voices (twice preenFM1)
. Midi over USB (in and out). Din5 still available.
. DX7 sysex bank import (don’t expect miracle but a good starting source to create new source).
. 4 steps envelope (level + time / DX7 like)
. Full floating point engine
. Huge number of preset banks (stored on USB stick)
. 27 FM Algorthms (schemas show up on LCD)
. Dedicated bootloader (3 ways of flashing new firmware : USB stick, sysex, DFU).
Same hardware as the original PreenFM except :
. DC 2.1mm for 7.5V or 9V wall adapter.
. Pins available for expansion
. USB stick to store presets, DX7 sysex files, firmware.
. STM32F4 based (168 or 192Mhz when supported by the chip)
. 2 audio jack
. Real DAC : 2 x 18bits (12+6)
On track for a release in October/November