ok, this is what i do. i plug my bass into my digitech bp200 then i plug that straight into my computer. and that's how i record. i use sound studio software. lately i've been wanting to double track my recordings. for example, i play the guitar part for metallica's seek and destroy on my bass, then i'd like to come in and edit the bass part in over that. what i do is set up two different files, on one i record the guitar part, and on the other file, the bass part. but when i copy the bass part and try to paste it over the guitar part where i want it to come in, it doesn't go to that exact spot. i always press play for the guitar part to play then i press stop real fast where i'd like to edit in the bass. but it's always off by like a second or milisecond. am i doing something wrong? any suggestions?