Electribe ER-1 never tight

[past]

Hi,

I plugged in the USAMO into the ER-1 and put it MIDI thru to my AKAI S3200. It's never really tight on the grid. I understand the machine has it's own groove but each drum hit is different which makes me think maybe something with the sync is wrong.
I can get the S3200 easily on the grid (with 1-2 samples difference) with each hit using "in monitoring" and the track delay with the USAMO (track = on) in MIDI Settings and 0 MIDI Sync Delay (Clock On, SPP and Sending SPP0).

Am I doing something wrong or is the Electribe probably well known for being not so accurate.