Good news. You can.I'm pretty sure this was always possible, but I am running latest firmware (188.8.131.52 at the time of writing)1. On the keystep, access the sequence number you want to delete via the seq/arp mode knob2. When the sequence is NOT running, press these buttons: RECORD, TAP (Rest/Tie), STOP3. This has effectively replace your sequence with a new sequence, 1 step long, where the step is a rest. Hope that helps!