If you can write new firmware for the Tone Board then you can you may be able to do extra things with them. See the start of the Hardware Volume thread where occip did just that - it includes info on wiring the Tone Board to the XMOS debug hardware too. There are basic DSP libraries for xmos available for example. Depending on what exactly it is you want to do you may also have to write a new driver for you OS though.
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