[sdiy] dsPIC Stuff

[Scott Gravenhorst]

My Brain Is An Electron:
http://electro-music.com/forum/download.php?id=32641

Sometimes I Repeat Myself:
http://electro-music.com/forum/download.php?id=32653

These two pieces were done using an 8 voice polysynth implemented on dsPICs
(a big thank you goes out to Tom Wiltshire for his help).

The "Harpie" instrument consists of 3 dsPIC33F ICs, one serves as a MIDI
controller and voice assigner which communicates via a one way SPI channel
to the other two "voice engines".  Each voice engine manifests 4
Karplus-Strong string models.  The Karplus-Strong model parameters for
reflection filter Fc and linear damping are controlled by pots feeding ADC
input pins.

The second piece was done by recording the same MIDI sequence twice - one
time an octave higher than the other and using Audacity, the two recordings
were offset some small number of milliseconds in time and then mixed into a
stereo track.

The synthesizer is built on 2 stripboards and all 3 dsPICs run at 40 MIPS
with a 20 MHz xtal.

-- ScottG
________________________________________________________________________
-- Scott Gravenhorst
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