Their a minor bug in the new beta firmware update for the DJM-S9.
In previous firmware versions, I was able to change the echo parameters (with the echo toggle off) without it change the sound/beat of the echo. I personally prefer the old way. Changing the echo parameter (with the fx toggle is off and echo still tailing out) without it changing the sound/beat.
The problem does occur with the mixer unplug of course.
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