I have to turn power boost again each time I use amp.

    I have a Power Rack and each time I play with my band and use my guitar cabinets I have to go into the power section and give the power boost knob a twist to get the power boost to take effect. The power boost value is stored in the head when I turn it on but the boost does not work until I give the knob a twist. Is this normal or do I need to do something? I have saved the output settings. Thanks!!