Korg M1 Owner's Manual page 37

Combination mode
PRE LEQ................................................ [–15...+00...+15dB]
This EQ control will boost or cut the low frequencies of the
input signal, before the compressor.
PRE HEQ............................................... [–15...+00...+15dB]
This EQ control will boost or cut the high frequencies of the
input signal, before the compressor.
DRY/WET .......................................... [DRY, 001...099, WET]
Adjusts the balance of the processed sound and the direct
sound.
Using MIDI control change messages to control the
speed of the Rotary Speaker
When you're using the Rotary Speaker as master effect, you
can use MIDI control change messages to switch the speed
of rotation.
Transmitting CC#76 (Vibrato Rate) with a value of 64–127
from your external MIDI device on the Global MIDI Chan-
nel (☞ "MIDI CHANNEL" on page 66) will switch the
rotary speed to Fast; transmitting a value of 00–63 will
switch to the Slow speed.
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