Kurzweil K2661 Musician's Manual page 529

Steep Resonant Bass:
Resonance
This function uses a two-pole lowpass filter to give you a sharper transition in bass response
than PARA BASS. Like PARA BASS, there are control-input pages for cutoff frequency and
amplitude, which are identical to those for PARA BASS. There is also a control-input page for
resonance (also known as "q"), which can boost or cut the amplitude of the partials near the
cutoff frequency.
Parameter
Adjust
Key Tracking
Velocity Tracking
Source 1
Source 1 Depth
Source 2
Source 2 Depth Control
Minimum Depth, Source 2
Maximum Depth, Source 2
You'll get the best transition in bass response with a resonance setting of -6 dB. There's a small
frequency range above the cutoff frequency where the response reverses direction (if you're
cutting the amplitude, for example, you'll get a slight boost just above the cutoff frequency). The
higher you set the resonance, the larger this reversal will be, resulting in unusual—but possibly
useful—response curves at high resonance values.
10 100
30
20
10
-12
0
-3
-6
-10
-20
-30
Range of Values
-12 to 24 dB
± 2.00 dB per key
± 30 dB
Control Source list
± 96 dB
Control Source list
Control Source list
± 30 dB
± 30 dB
Frequency in Hertz
1000
18
Cutoff frequency = C 3;
12
gain = 12 dB;
resonance from
6
-12 to 18 dB
DSP Functions
The DSP Functions
10000
16-33