Yamaha S90 ES Owner's Manual page 120

Internal Structure (System Overview)
Part EQ
[PERFORM] Performance selection
[MULTI/SEQ PLAY] (select Multi mode)
This 3-band EQ is applied to each part of the Performance/Multi, The high band and low band are the shelving type. The
middle band is the peaking type.
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The part EQ is not available in the Voice mode.
Master EQ
[VOICE] Voice selection
[PERFORM] Performance selection
[MULTI/SEQ PLAY] (select Multi mode)
Master EQ is applied to the final (post-effect), overall sound of the instrument. In this EQ, all bands can be set to peaking, or
the lowest and highest bands can be set to shelving (as shown below).
EQ for which all bands are set to peaking type
Gain
Q (frequency bandwidth)
+
0
–
3 bands
LOW LOWMID
120
Owner's Manual
[EDIT] Part selection
Multi selection
Gain
+
0
–
3 bands
LOW
[UTILITY] [F3] VOICE
[EDIT] [COMMON]
Multi selection
Frequency
MID HIGHMID HIGH
[F3] EQ
[EDIT] Part selection
Q (frequency bandwidth)
Frequency
MID HIGH
[SF1] MEQ
[F2] OUT/MEF [SF2] MEQ
[EDIT] [COMMON] [F2] MEQ/MEF
EQ for which LOW and HIGH are set to shelving type
Gain
+
0
–
5 bands
LOW LOWMID
[F3] EQ
[SF1] MEQ
Q (frequency bandwidth)
Frequency
MID HIGHMID HIGH