I have just done a live band recording with my QU16 which is great. I have all of the files stored on my hard drive. However, I need to add some extra instruments on free channels. Can I just play back the other channels and record on the free ones / and / or record over single channels. Sorry if this is really obvious but I’m not that experienced with recording yet on the QU.
You can but you will then need to realign the tracks - don’t be scared by that, just make sure you record one of the original tracks (that you are playing back) again - and then that can be used to make sure that the additional IO latency isn’t applied as a time offset to some of the tracks.
Rereading the question that might not be the answer - That assumed USB-B streaming to a full DAW.
If you are talking QuDrive, then no - but you can play back from USB-B, add in other channels and record via USB-B.