I'm not talking midi I don't use It either. I use .wav files that i record and loop. Any how the arp seems to run faster than my song. I am using Logic on a PC and If my bpm Is 120 on a few arps in the MS2000 i could see the .wav file was not falling on the beat after a few measures which tells me It was drifting out of time.

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http://www.mp3.com/aminotransmitter