2lim,
Why don't you paste the tracks after they are in the computer? No need to ping pong. Are you analog or digital? With my 4trac digital I cut the drums in stereo add bass and rhythm guitar then I copy the whole mess to another song ping pong it all down to one trac for monitoring. I use that copy for three part harmonies or whatever. If I want to add anything else like solos. I copy the original 4 tracks to a third song ping pong again for monitoring and I have three tracks open again.
I send everything over to the computer seperately or in stereo in the case of drums, through effects and compression. I apply noise reduction with my editing software and mix/paste the tracks together there. Listen to my first Mp3 posted here. It's not the best but it works pretty well.
Rusty K