And here's the official response from Roland Canada when I reported the RC-3 phrase lag bug. What a useless hopeless answer. Very disappointing!
Thanx for supporting BOSS. There may be a 1 sec delay to upload next memory: this function was essentially to switch from a song to another without having to reach down. If you want to be able to switch from a phrase to another (Intro, verse, chorus), you can try our BOSS RC-50 which offers that option. You can actually record three independent phrases on three different pedals on the unit. It also offers more control over your recorded loops: independent volumes, PAN, more drum patterns and more.
Best Regards / Sincèrement vôtre,