Recording guitar with rakarrack and audacity

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http://askubuntu.com – I'm trying to record my guitar with audacity and using rakarrack for effects. I have an Lexicon Alpha plugged in with USB and my guitar plugged into the Lexicon Alpha. I am able to record my guitar etc, but I cannot record my guitar through Rakarrack. JACK does not seem to recognise the Lexicon Alpha. How can I make this working? (HowTos)