Thru machines listen to the OT’s audio inputs so that you can add effects to the signals and mix them in with the sound produced by the OT itself.
At the same time you can use Flex or Static machines on the other OT audio tracks to play your own samples (including loops).
At the same time, you also have 8 MIDI tracks available for sequencing other MIDI gear.
The OT is nothing if not versatile.