Since the electric vacuum is in-line, a rheostat could be installed
to decrease the vacuum strength and the pedals could be used, thus
creating a vac-assist pedaling, since the extra power is needed in
play mode.  It will also quiet the noise of the vacuum turbine.

One needs to acquire a fan or motor controller, not a lamp dimmer,
as the amperage is insufficient on the latter.

Regards,

Jon Page, piano technician
Harwich Port, Cape Cod, Mass.

PS: Don't Forget To $upport MMD.