The range for the DXMB’s GAIN knob is -6 dB to +20 dB.

Yes the GAIN knob allows you to equalize the volume when the effect is engaged vs. true bypass mode.

While in the UB or LB modes the Mono output will have whichever mode you are set to, the R output will have the other band.

For example, if you are in UB mode, the UB effect will come out of the MONO output, the LB effect will come out of the R output. Vice verse when you set it to LB mode.

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These diagrams show exactly what’s going in the Ring Thing while in RM (Ring Mod), UB (Upper Band) and LB (Lower Band) modes.

RM mode is the second diagram. In RM mode you will have both the upper and lower bands present, along with your original signal if mixed in using the BLEND knob. So if you have the Ring Thing to frequency shift your signal by 200 Hz and you put in 400 Hz, your Ring Mod output will be two signals one at 200 Hz and the other 600 Hz. Mix that with your dry signal and you have three frequencies present.

In UB mode (the third diagram), the lower band is eliminated so that the effect only produces the upper band frequency. In the above example you would only hear the 600 Hz signal plus your dry signal, no 200 Hz signal.

In LB mode (the last diagram), the upper band is eliminated so that the effect only produces the lower band frequency. In the above example you would hear only the 200 Hz signal plus your dry signal, no 600 Hz.

Does the volume of the noise change with the Volume knob setting? Meaning does it increase as you turn up the volume?

There is, she’s the singer in my band.

We are looking into the cause of the problem, there are a couple of things that might cause it.

The DXMB (Deluxe Memory Boy) will definitely not have this problem.

The input impedance is 2 Mohms.