via stekern on this electro-music.com thread:"This is a project I have been working on for a while.
It is a subtractive synthesizer implemented in an FPGA.
Features:
* 2 DCO's with sawtooth, square, triangle and sine waveform generation
* LFO that can be modulate the filter, amplitude or pitch. Possible waveforms are: sawtooth, square and triangle.
* LP-12 filter with adjustable frequency and resonance.
* Filter envelope
* Amplitude envelope.
I have been using a Avnet spartan 3A devboard with a breakoutboard with midi connector and a I2S DA-converter.
In this device the polyphony is set to 8 voices, but it is easily adjustable in the VHDL-source code. I also have received reports that it is easy to implement several SK-Synths to achieve multitimbrality (on a spartan-3e board).
The synth is controlled by a computer application written in Qt and it runs on both Linux and Windows.The source code for the synth and the controller application and schematics for the breakoutboard can be found in my SVN-repository here
Here is a zipped SVN-snapshot from 2010-08-05"
Samples at electro-music.com
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