HI everybody, I tried all of yours suggestions but no result 
Until I find a solution, I use my boss FV 500 H like a volume pedal ! I connect my guitare into the pedal, I come out of it and come into the Kemper ! That works 
but I would like to find the solution to use my pedal like an expression pedal to control the volume without tune trouble 
Thank you at all for your interest to my problem
Thank you for your answer I do it immediately !
Hello everybody, I use my kemper with a Rocktron Midi Raider. In the perform mode, I use it to change the preset into a performance ! I use a BOSS FV 500H like an expression pedal to control my volume ! despite the fact that my volume pedal is in maximum position, the tuner appears at each preset change and cut my sound! It would do it normally only if my volume is at this minimum (0) !
Is there somebody to help me
In advance, I thank you
I' am sorry because I don' t speak English very we'll
