I am recording to a Samplitude program on a laptop from a Yamaha P125 via USB using ASIO drivers, but I feel my problem must be general; when I play back my already recorded tracks as a monitor it also re-records the existing tracks with it, though at a lower volume, on the new track. This because USB is two-way and so mixes my new keyboard track with the existing tracks. How do I just use the existing tracks as a not-to-be recorded monitor? Even if you're not acquainted with Samplitude, which has lots of options, what do I need to do in general terms either with my hardware config or the software? Thank you.