Rodgers Topper Owner's Manual page 23

The TAPE LEVEL knob is pulled out to record from the organ.
Leads are plugged into the two top phono jacks (RCA type)
labeled "To" (left-right). The other ends of the leads are
plugged into the recorder input jacks. The expression pedal
of th~ organ is used to regulate the recording levels to the
tape deck. (The TAPE LEVEL knob does NOT control the recording
levels.) The REVERB knob may be pulled out to record in
$ilence.
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