Hi Scottyee

The FV50L is not actually designed for how you are using it, but if it works then I wouldn't bother changing. At the end of the day, they all just have a pot inside them adjusting the volume if it were a master volume controller on the keyboard. The one I was saying had a dedicated expression socket was the FV500L not the FV50L (which doesn't have it) but as I say... if it works then there is no problem.

John
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Roland G-70, FP-4, BK-7m, SonicCell, KC-350 x 2, DS-5 x 2, A300-Pro, Sonar X1 PE, BR1600CD
Yamaha HX-1 System 1, KA-20x2