Yamaha MU100 Owner's Manual page 81

4 Set the specific frequency to be adjusted.
For this example, set the Low Frequency value to "315" (Hz).
5 Select the Low Gain parameter and adjust the value.
For this example, set the Low Gain value to "+35." Play the
Voice (especially in the lower octaves) and hear how the sound
has changed.
NOTE
Depending on the Voice selected for the Part (and depending in which octave you
play the Voice), you may or may not hear very much change in the sound at
certain frequencies.
If you want, try adjusting the High Frequency/Gain parameters as
well.
EQ in the Performance Mode
The EQ settings of individual Parts in the Performance mode can be adjusted
in the same way:
1) Select a Part (in the Single Part controls).
2) Press the [EDIT] button.
3) Select "PART", then press the [ENTER] button.
4) Select "EQ", then press the [ENTER] button, and edit the parameters as
shown in steps #3 – #5 above.
Guided Tour
Equalizer (EQ)
83