Filter Operation - Akai MFC42 Operator's Manual

Chapter 2 Basic Operation
Level
Low
[Pole]
Determines the shape of cut-off curve. The larger
the number, the sharper the curve. The sound
character is different with different curves.
(1 pole = -6dB/Octave)
Note: Up to 8-pole is available on Mono channel.

Filter operation

Let's master the operation of MFC42, confirming how the sound changes when the signal goes through
the filter, in the actual application.
The following is based on the connection of rhythm machine (stereo connection), but the operation of the
MFC42 is the same with other devices.
<Preparation>
(Connection to rhythm machine)
Connect the stereo output of the rhythm machine to the STEREO IN connectors of the MFC42. Connect
the OUTPUT L/R to your sound monitor system (or connect your headphones to the headphone jack,
instead).
While the MAIN VOLUME is turned down, turn on the rhythm machine, the MFC42 and then your monitor
system in that order.
(Level adjust)
Adjust the level of MFC42 while playing
the rhythm machine. Turn the INPUT and
LEVEL knobs on Stereo channel fully
clockwise. Next, turn the MAIN VOLUME
(or PHONES LEVEL for headphone) up
to the appropriate level.
(Panel settings)
Turn the RESONANCE fully counter-
clockwise and the CUTOFF knob to 2
O'clock position, and set the FILTER
TYPE switches to LOW PASS (both switches down) position.
Now, we're all set to experiment.
(Auto-tuning)
As the characteristic of analog circuitry, the heat makes the filter cut-off operation unstable. With the
built-in Auto-tuning function, it self-adjusts the internal filter circuit optimal.
• Press the MIDI CH. and CC NUMBER keys simultaneously to start it (bars on LED flash while auto-
tuning). Perform this auto-tuning when the unit is warmed up.
8
RESONANCE knob fully counter-clockwised position
Cutoff frequency
As the knob is turned up . . .
Frequency
High
Level
Frequency
Low
Frequency
Cutoff frequency
( -3dB)
High
2POLE ( -12dB/oct )
4POLE ( -24dB/oct )
8POLE ( -48dB/oct )