Working With Filters - E-Mu Proteus 1000 Operation Manual

Working with Filters

Move the cursor to the first field in the bottom line and use the cursor
4.
buttons to advance to the Release pages.
Increase the Release 1 and 2 times. Note the effect as you release the key
5.
on the controller. The Release stages controls the time it takes for the
sound to die away when a note is released.
The filters make it possible to remove certain components of the sound. A
low pass filter removes the high frequency components or put another way,
it "lets the low frequencies pass." A high-pass filter removes the low
frequency components from the sound letting only the high frequencies
pass. See "Proteus 1000 Filter Types" on page 105 for a complete list of
Proteus 1000's filters and their descriptions.
In preparation for the next tutorial, select the Default Preset.
Go to the Instrument screen (Edit menu) and select Instrument #321 -
1.
Rast Keys. This is a really buzzy sound. Since filters work by removing or
accentuating certain frequencies, we want to make sure that we have a
lot of frequencies to start with.
Advance to the Filter Type screen using the Data Entry Control. Select
1.
the Classic 4th order filter.
L1
FILTER
Classic
Go to the Filter Frequency and Q screen. Position the cursor in the Freq:
2.
field as shown in the following illustration.
L1
FILTER
Freq:
The Frequency parameter determines the filter cutoff frequency or the
frequency the filter uses as the highest frequency allowed to pass.
If you play the keyboard now, you should hear the raw Looped Perc 1
sound. Slowly decrease the filter cutoff frequency value as you play the
keyboard. The sound gets more and more dull as you remove more and
more high frequencies from the sound. At some point, the sound
completely disappears. (You have filtered out everything.) The chart on the
following page illustrates what you just did.
Ord
4
255
Proteus 1000 Operation Manual 133
Programming Tutorial
Editing Presets
Type
LPF
Q: 000