Part 4 Here's the control box... At it's heart are the guts of a Pioneer MA-12 mic mixer with a spring reverb: I kept the electronics and discarded the case. I made some small adaptations - removing the unnecessary features such as the tape/source selection and associated inputs and outputs, and adding wiring to bring the controls off the PCB for mounting in the new casing. The mic that I installed in the rotary-isolation cabinet is one of these... ...a National electret condensor mic. I'd separated the mic from the power unit thing, which takes an LR44 1.5v button cell battery, in order to install that part in the control box. Luckily, by tracing the PCB of the MA-12 and testing with a multi-meter, I could find a suitable point to tap power for the mic and so do away with the need for batteries. The above, however, forms only one half of the unit - the output side of the things. The other side is the input and speed control for the rotor.