FREQUENCY1
With the FREQUENCY1 knob you set the cutoff frequency (or center frequency in BP and BR mode). If you for example select a lowpass (LP) filter and turn the FREQUENCY1 knob clockwise, a more and more high-frequent signal will be output from the filter.
The more you �open� a lowpass filter, the more high-frequent the output signal
Note that if the EnvAmt value is above zero, turning the FREQUENCY1 knob might not change the sound as expected.
FILTER SLOPE (ROLL-OFF) (R
The slope of a filter determines how steep the frequency attenuation curve is. In Single Filter Modes in Nord Lead 3 you can select between 6 dB/octave (1-pole), 12 dB/octave (2-pole) and 24 dB/octave (4pole) slopes for the LP (lowpass), HP (highpass) and BP (bandpass) filters. Press the FILTER SLOPE button to switch between different slopes.
The figure shows a LP filter with 24 dB, 12 dB and 6 dB slopes.
24 DB/OCTAVE B/O This is the classic �synth filter� slope used in the Minimoog and Prophet-5 among others. It cuts out frequencies rather drastically, 24 dB per octave. A 24 dB filter is also known as a 4-pole filter. 12 DB/OCTAVE B/O The 12 dB/octave slope leaves more harmonics than the 24dB variation discussed above. This type of filter has been used in various early Oberheim synthesizers and others. A 12 dB filter is also known as a 2-pole filter. 6 DB/OCTAVE B/O The 6 dB/octave slope is very gentle and doesn�t cut out very much in the frequency spectrum. A 6 dB filter is also known as a 1-pole filter and is the simplest type of filter.
RESONANCE
The Resonance parameter is used to further adjust the characteristics of the Filter. If you are using the HP, LP, CLASSIC or DIST LP filter types, increasing the Resonance will emphasize frequencies around
