Hi the mono/stereo switch is for listening to mono records. The preamp is already dual mono inside including power supply & gain stages. The only point they come together is on the volume pot which is dual ganged. In theory you can dual mono if you fit separate left and right volume controls. If you can find a copy of the VTL Tube book it gives you information on the pre and circuit information. How does this compare to your Motif MC7.
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