Vivid B1

[bobertk]

you can do 2 things: either you use the two buttons in the way that one switches SAM on and off and the other opens the tone settings. In this case you will find the SAM % as 4th option in the tone setting (balance, bass, treble, SAM). Or you define the middle button with SAM on/off. Then a long press brings you in the tone menu where again SAM % is the 4th option. This only works on the middle button, the right button will always show the system menu on a long press.

I do not get SAM % as 4th option....