Main/Ensemble/Echo Switch (New B3/C3, Portable B3)
This switch gives you the ability to hear either of the two Leslie speakers connected to your organ or both of them. This half-moon switch mounts on the front rail of your organ via the thumbscrews provided and plugs into the appropriate jack on the organ.
Actual item may differ slightly from photo.
Part number 508-MES1 NB3