Kurzweil K2661 Musician's Manual page 585

Programming Examples
Press the more> soft button, and the three soft buttons that select the control-input pages for the
lowpass filter will appear. Press the F1 FRQ soft button.
The Coarse Adjust parameter will already be selected. Try a few different values for this
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parameter, to get a feel for its effect on the sound. Then set it to a value of G 3 208 Hz. Use the
cursor buttons to select the Src1 parameter, and set its value to MPress (3, 3, Enter). Cursor
down once to the Depth parameter, and set it to a moderate value, like 3800 cents. Now try
playing and applying pressure to the keys. (Obviously, this will have no effect if your MIDI
controller doesn't send mono pressure.)
Now we're going to use an envelope to control the sweep of the filter. The K2661 has one
envelope dedicated to shaping the output of the sound; this is called AMPENV. However, two
other envelopes (ENV 2 and ENV3) can be assigned to control other parameters. You can assign
AMPENV as a Control Source, but using ENV2 and ENV3 lets you assign separate envelopes to
do different things.
Cursor down to the Src2 parameter, and set its value to ENV2 (1, 2, 1, Enter). Move the cursor
down to the DptCtl parameter and set its value to ON. Cursor down to the MaxDpt parameter,
and set its value to 5800 cents. As soon as you set a depth, you'll hear the envelope sweep the
cutoff frequency. We'll adjust it further in a minute. The F1 FRQ page should now look like this:
Next, press the F2 RES soft button to select the page for adjusting the resonance of the lowpass
filter. Select the Src1 parameter, and set its value to Data (6, Enter). Select the Depth parameter
and set its value to 30.0 dB. This means that the partials at the cutoff frequency will be boosted
30 dB. The F2 RES page should look like the following diagram.
Slider A (Data / MIDI 06) will now affect the resonance of the filter. Be aware though that the
change in resonance is subtle; resonance affects some waveforms more noticeably than others.
You may want to set the Pad parameter on F1 FRQ page to a value of 18dB or so, then set the
Gain parameter on the OUTPUT page to the same value; this reduces the potential of clipping
due to resonance.
Next press either of the <more> soft buttons until you see the ENV2 soft button. Press it to select
the ENV2 page. Here you'll program Envelope 2 to control the filter's cutoff frequency.
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