Korg Synthesizer/Vocoder microKORG Owner's Manual page 48

LOW EQ FREQ. [40Hz...1.00kHz]
Sets the frequency of the low-range
equalizer.
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18. EQ
— SYNTH/VOCODER
This is a two-band equalizer. Use EQ FREQ (knobs 1 and 3 to specify the frequency that you want to adjust, and use knobs 2 and 4 to adjust
the gain of each frequency band.
Excessively raising the equalizer gain parameters may cause the output to be distorted.
LOW EQ GAIN [-12...12] HI EQ FREQ.[1.00kHz...18.0kHz]
Sets the amount of boost or cut for Sets the frequency of the high-range
the low-range equalizer. equalizer.
HI EQ GAIN [-12...12]
Sets the amount of boost or cut for
equalizer.