Hello again,
(sorry for the long delay..lot of work to do during the last few weeks)
unfortunately the guided access isn’t the solution for this problem.
Basically i need a layer with 3 faders/button(s) on it (mic-vol., music-vol. and a switch between the music sources (cd/usb/aux) ).
For a lot of the presenters in the fitness business, that’s already particular-physics.