Hello Rakarrack! Welcome! I discovered your project at Linuxtag Berlin 2008, right at the Jacklab Booth. It was a pleasure trying a Behringser USB guitar with a ASUS eeePC running Rakarack:
I tried to copy their settings from a camera shot (attached). But wouldn't it be great to deliver at least one default setting?
I also found out that to compie 0.1.2 on Debian, I had to install libfltk1.1-dev, libxpm-dev and maybe also libsndfile1-dev
Keep going, you rock!