I haven't used the kit for some time, but I'd like to have some time to continue experimenting with it.
I have knowledge of some other platforms for audio effects development, like the FV-1 from Spin Semiconductor or The OWL, an open source platform.
Another possibility could be to make your own development platform, I think its not so hard, you can learn a lot from the documentation of the ToneCore DSP dev kit or The OWL, maybe you can use an ARM and an AVR processor, both has open source compilers that runs on multiple platforms, so the toolchain would be more versatile.
If you like the last idea, I'm willing to help you with that, just tell me, or maybe we can continue developing with the ToneCore.