I thought the tone control was in the back as per the Rob Allen site...
Is there a tone control? yes, Mb-2 and Mouse 30 basses have a passive high trim control located in the back cavity. You can access this through a small hole in the back plate with a small straight screwdriver. Wide open (full clockwise) is "flat", and as you back it off (counter clockwise), you will reduce high end. This is a subtle control, and is mostly to fine tune how much finger noise and articulation you want in your sound. I think of it as a master control, a "set it and forget it" that you can fine tune the overall sound with.