Hi Rick, I owned one and have documented some of the RC-50 features on my website. http://euroloopfest.com/sjaak/rc50.shtml In addition to that, check out the 6 RC-50 support documents of Boss at http://www.rolandus.com/products/productdetails.aspx?dsection=d_support&ObjectId=772 > 1) Are all the synchronized three loops always the same length? No, they can be of different lengths. The longest loop (phrase) determines the start and stop points of the 3 phrases. Check out support guide 5 called "Guide and Loop quantize" page 11/12 > > 3) Does the RC-50 do double or half speed manipulations of the loop No > 4) Does the RC-50 have any kind of feedback control of loops? Not like on the EDP or LP1, but's there's a workaround. You can setup a feedback loop using the aux-input, see http://euroloopfest.com/sjaak/rc50_feedback.shtml > 5) is there any way to have two loops synced and a third loop random in > legnth Yes, turn loop sync off for that phrase. > 6) Does this unit have any UNDO features. Yes, it even has an undo pedal :) --- Sjaak http://www.livelooping.be/ http://www.overgaauw.be/ http://www.myspace.com/sjaakovergaauw __________________________________ Scarlet schrapt download limiet! ADSL20 NO LIMIT voor € 29,95. Ga naar www.scarlet.be voor meer info!