Hi Herb, Usually when I do a pianomation install, I dummy up the middle pedal with a spring. I have a theory that sostenuto pedals were really invented for piano tuners (tunings wide intervals like 12ths which cannot be played with one hand - but that's another topic). If it's important for you to have a working sostenuto, you need to obtain another sustain pedal assy from QRS (not included in the base kit) and install it in a similar way to the sustain pedal. If you've installed a few of these systems you know that sometimes you have to get quite creative with the pedals! - Matt
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