Hello, I do not sing either, and I am starting getting more jobs than other keyboardist that sing......you wonder?...I arrived in the Phoenix Arizona area only 2 years ago, and I began to work in the "Tea dances", nursing homes, RVs, etc....and most of this places book 1,2 even 3 years in advance...
I play with a PSR 3000 and a Korg PA60, I did have a Ketron SD1 too....
One thing I can say, I do NOT use SMFs....I PLAY....and I guess people like my music, I do have a lot of repertoire, and I try not to repeat songs in the same place, or if I do, I play them in diferent way....or use another styles...someone sid to me long ago, if you became predictable, you became boring....Hope it helps.

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mdorantes