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DSP for 3e audio amp

Hi all,
I recently purchased a completed class D amp with DSP from 3e audio. I want to use the DSP but have no experience (total newbie except for a Bottllehead amp kit and Fostex 208 speaker build years ago). As far as I know, I have to buy this:
freeUSBi - complete kit | Audio and signal processing | even elements Shop

I have to open the amp and plug a cable into the box. That's about as much as I know.

Unfortunately this seems to be sold out everywhere. Any help would be greatly appreciated. Thanks
Ade