pianola.orgpianola.org/pdfs/wm_testroll_98.pdfment (red). In normal play (piano to mezzo- forte),...
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pianola.orgpianola.org/pdfs/wm_testroll_98.pdfment (red). In normal play (piano to mezzo- forte), the green button is in action, in forte play the red one 1 both are controlled auto-
