Need some advice. I bought a well used Peavey Bandit 112 USA-made red stripe with the Sheffield Speaker. Over on the right hand side of the control panel is the Master section. None of the controls over here do anything. Reverb doesn't work, Presence doesn't work and neither does the Tube Dynamics. The amp's hiss does increase as some of these controls are moved to max. I offered $40.00 less than what the guy was asking and he accepted. In the end I paid $140.00 for it. It sounds good and I don't really miss having this section but was looking for some feedback on options. Thanks!