Aah, the cleverness of context sensitive interfaces. I had Midi Forward checked, which hid the Merge options. As soon as I unchecked MIDI Forward, voila! Thanks!
I'll keep you posted. I'm impressing myself (probably shouldn't) as I'll be controlling the Morningstar MC3 controller (great little thing) from the PBC and I'll be controlling the PBC loops from the MC3. This might actually allow me to stop investing so heavily in P-Touch tape. Ron / Sherri, et. al., you are the best. Over the years, I've owned a GT22, GT16, GT10, effects gizmos, amp gizmos, and currently my beloved PBC, which has given me so much on itty tiny stages. Thank you.
Gimme a PBC6/x with single line multicolored screens above each button a la GT, and my head will explode. Seriously, I might not survive the gush.