Hello, I had several Electone models, most of the Yamaha line had them, back in the 70īs the consoles where: E10R, E5, EX42, Gx1,Gx2, spinets, Dk40.....bk20, Bk35, etc..and that knee lever was for sustain/hold, even the lateīs EL series (I still have the EL90 ), have them.
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mdorantes
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mdorantes