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by codetocontra_Archive
In terms of the Boss RC loop pedals, they will quantize to an internal rhythm guide (drum samples) which requires some premeditation on how long and what speed you want to loop. I am not aware that quantization syncs to an external source. The RC20 has a tap tempo feature that would allow you to adjust the speed of a recorded loop without changing pitch. In order to make an adjustment on the fly to resync with a drum machine would require speeding up the loop to match the tempo then trying to reset the tempo to be in sync again. I think that would prove frustrating.The more simple solution would be using a looper with a single stomp to stop, and another stomp to restart the loop over, like a Headrush. Other loopers have a retrigger feature that will restart the loop to the beginning, such as the DL4 (but it will automatically stop at the end of the loop, hence "Play Once") or a Timeline (which restarts at the beginning and will continue to play the loop). These pedals are much more useful when syncing to an imprecise human drummer, who may shift in timing a bit even at some micro level, or who could even adapt to an imprecise looped guitar part. If you are planning to sync your loop to a drum machine the most elegant solution is to pick a looper that accepts MIDI time sync. It would take a lot of hassles out of the scenario. There are always quirks though, in general. Older versions of Boomerangs would sync at the start, but slowly drift off a millisecond every pass of the loop, which would become desynced over a large number of repetitions. Some loopers continue to monitor the MIDI time code to stay in perfect sync. My point is that while the MIDI sync should be perfect, more research would be needed to see if any particular looper will in fact stay in tempo with your particular drum machine. Hope this helps.