Yamaha SY35 Product Manual page 94

MULTI
Settings:-24 ... 0 ... +24.
Procedure: Press the [NUMBER/MULTI PART
SELECT] key corresponding to the desired
multi-play part.
Use the [ ] cursor key to move the cursor to the
lower display line. Use the [-1/NO] and
[+1/YES] keys to select the desired degree of
note shift.
Details: A setting of "-12," for example, shifts the
pitch of the selected voice down by one octave; a
setting of "+4" shifts the pitch up by a major
third. The maximum range is plus or minus two
octaves.
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The Note Shift function can be used to transpose
a voice to its most useful range, or to create
harmony (intervals) between different parts in a
multi-play setup.