This issue is likely caused by the external clock settings. Ensure that your Super 6 is not waiting for MIDI clock signals to be received, otherwise the arpeggiator and sequencer won't play back any patterns for as long as no MIDI clock is being received.
- Press the SHIFT button.
- Press the EXT CLK button.
- Double-check if the LED of patch button 2 is solidly lit (on) or flashing (off).This patch button indicates whether an external MIDI clock signal is being received or not.
- If patch button 2 is solidly lit, press this button to disable that MIDI clock signals will be received.
This global setting will be automatically saved after 30 seconds of no interaction with your Super 6.