Q88 and Logic 10: volume goes down when I hit All Notes Off key

I am using the Alesis Q88 keyboard with Logic 10.0.7.

With any software instrument, whenever I hit the Eb above middle C (the key below the All Notes Off function), each time I hit the key, the volume of that instrument is decreased a bit until it is totally muted.

I figured out the solution once before, but I can't remember what I did to fix it.

How do I deactivate the Advanced functions while I'm using the keyboard to play?
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