I use and love n-Track Studio. I'm also playing with the demo version of Multitrack Studio. Both are under $100.00 and work very well. I've been very impressed with Multitrack with the exception that it seems to be more prone to over driving and thus distorting the input. Everything else I've played with to this point leads me to believe I'll purchase it in the near future.

Check 'em both out.

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DakLander