This might be your issue and solution:
10.3.2 SCENE VOLUME LOCKING
Certain parameters specially made for volume fades are available exclusively to scenes.
The XLV, XVOL and XDIR parameters can be regarded as a set of extra volume controllers on top of the LEVEL, VOL and DIR parameters.
The difference lies in the way they handle volume fades. Locking them accordingly will make the crossfader fade between the volume of the tracks or inputs in an equal energy fashion. This way of locking volumes is suitable when wanting to avoid the volume dip that otherwise would occur when the crossfader is used to fade between two tracks and reaches the center position.
The parameters are only visible when keeping a [SCENE] key pressed. The XLV parameter is found as an overlay to the LEVEL parameter found in all TRACK PARAMETER pages.
The XVOL parameter is found in the AMP MAIN menu. The XDIR AB and XDIR CD parameters are found in the MIXER menu.
The XLV parameter can be locked to two settings.
MIN will mute the signal, post track effects.
MAX will let signal through at the set LEVEL signal level.
The XVOL parameter (on the AMP menu) can be locked to two settings. MIN will mute the signal, pre track e ects.
MAX will let signal through at the set VOL signal level.
The two XDIR parameters (on the MIXER menu) can each be locked to two settings. MIN will mute the signal.
MAX will let signal through at the set DIR signal level.
Pressing the LEVEL knob while holding down the [SCENE] key pressed will remove the LEVEL lock. An XVOL lock is removed by pressing the corresponding DATA ENTRY knob while keeping the [SCENE] key pressed. An XDIR AB lock is removed by pressing knob B while keeping the [SCENE] key pressed. XDIR CD is removed by pressing knob C while keeping the [SCENE] key pressed.
(It’s a lot, but figure it out and you can do smooth transition or roll your own technique)