MkIIb's input jacks under the chassis

[janarn]

I have two input jacks under the chassis in my MkIIb.
One is a on/off switch for the reverb.
What is the use of the other input jack?

 

[skizziks]

If your IIB has no graphic, the reverb switch jack will also control the gain boost function using a TRS plug and double footswitch. The other jack is a tap point for the junction of the preamp and power amp. Maybe you should visit Boogie website and download owners manual for details. I just brought my IIB back from the dead and am loving it. Luck Skizziks