Yamaha SY85 Owner's Manual page 35

FixNote (Oscillator fix note number)
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PERFORMANCE EDIT MODE /
Sets the frequency (note) at which the selected layer will be played when
the "fix" mode is turned on ("---" is displayed in place of the note when the
"fix" mode is turned off).
The C-2 to G8 range of this parameter covers a full 10-1/2 octaves. "C3"
corresponds to "middle C" on a keyboard.
QUICK EDIT