Ample Guitar does not respond to multi-channel bending !

[KK959]

I use a MIDI guitar controller to play Ample Guitar M II Lite in MIDI guitar mode, but I found that Ample Guitar cannot distinguish bending from different channels.

For example, I bend up the note in channel 11, then I immediately send a note in channel 12 and bend it down before the note in channel 11 is off.

I found that the bending in channel 12 will also affect channel 11, resulting in a very strange bending sound in channel 11.

I tried different settings in Ample Guitar but can't correct the above problem.

Am I missing something ?