Very Simply, a bounce is when you take 1 or more tracks that have already been recorded, and put them on another empty track. Example: You have guitar, bass, and drums on track 1 , 2, 3, in that order. You want to put them all together on track 4.
1. while playing back from start, raise the fader on each track until you have a good mix. 2. right above the fader for each track, turn the "L" "R" pan pod to "R". That's because track 4 is on the right "bus".
3. Engage track 4 to be ready to record and go! You are now "bouncing" tracks 1-3 to track 4. Watch to be sure your new record levels to track 4 are at the optimum level- not too "hot", and not too low. Hope it helps.