E-Mu Vintage Keys Operation Manual page 83

PRACTICE PROGRAMMING
Playing the keyboard now, you should hear the raw Violin Trio sound.
Slowly decrease the filter Fc as you play the keyboard. The sound will
get duller and duller as more and more high frequencies are filtered
out until at some point the sound will completely disappear. (You
have filtered out everything.) The chart below illustrates what you just
did. You moved the cutoff frequency down.
Open the filter back up to 255, then move the cursor underneath the
Q. Set the Q to 15, then move the cursor back under the Fc. As you
change the Fc, notice that the sound now has a sharp, nasal quality.
With a high Q, frequencies at the cutoff frequency (Fc) are being
boosted or amplified.
Now let's modulate the filter Fc with the Auxiliary envelope generator.
The envelope generator is a device that can automatically change the
filter Fc during the course of the note. Set the Fc way down until you
can just hear the sound (about 60), then press Enter and go to the
REALTIME CTL screen.
Move the cursor down underneath the source and set it to Aux (for
Auxiliary Envelope). Next move the cursor underneath the destination
and set it to Filter Fc. The screen should look like this:
74 Vintage Keys Operation Manual
Cutoff Frequency
100
80
Output of Filter
60
40
20
40 80 160 360
Frequency
REALTIME CTL
1 PWhl -> Off
REALTIME CTL
1 Aux -> FiltFc
...
720 1440 2880