For those who might want this capability I have found a pretty suitable workaround: use the master mode and terminate the first loop by starting another new loop to act as the first 'stacking' layer. This takes only a single tap and if you want to continue adding material after that it's usually easier to activate stacking on this second loop since things are kinda rolling along at that point. Might be worth a try vs waiting.
From: Gareth Whittock
Sent: Mar 28, 2012 10:55 PM
Subject: RE: Boomerang midi sync and how to check software version