You can use the Flex switch in Play mode when the PitchFactor is set to the HarPeggiator algorithm. It will restart the sequences. If your timng is good, sequences can be restarted 'creatively'.
For MIDI users, it might be a good time to reconsider a MIDI Start/Continue message triggering (or even sent by) the Restart function. The groundwork was laid in the new TF/H9 Looper algorithm. I suppose there's a workaround in sending a parallel CC message to the Flex function.
