how can I record my acoustic guitar on Linux using Ardour and Rakarrak?

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http://askubuntu.com – I'm running Linux, and was recommended to use Ardour and Rakarrak for recording, but I haven't even gotten Jackd to recognize my guitar. Currently, the guitar is connected with a 1/4" to 1/8" cable directly from the pre-amp pickup in the guitar to the Mic In on my computer. Help! (HowTos)