I can't get the manual either however I owned a Roland JV880 which is fairly old so may be similar. Most Roland stuff is.The JV was an 8 part multitimberal unit. What this meant was that in performance mode there were 8 different parts that could be played. You could also save a performance setup into memory. When you called up this performance all 8 instruments were pre defined for you. I think this is were you are getting confused about the limited number of instruments available in performance.Call up a blank performance or edit an existing one.Set each of the parts one at a time to receive on different midi channels. Say 1 through 8 with drums on 10.Now when you record from your keyboard it's midi out channel is probably set to channel 1 so thus the track you record will play back on channel 1.After you're done recording you need to reset the recorded track to one of the 8 receive channels & set a patch in PT on that track.If you don't all the tracks will be sending on the channel that was used to record.If your unit is 8 part like mine you'll be limited to 6 tracks.When done you should have 8 tracks in Power Tracks that have midi channels 1 through 8 assigned for out with 8 different patches.This data will cause the 8 different parts to play those tracks with the correct patch.

John
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