10.6

135Logic Pro Effects
• Boost A and Boost B knobs: Set the amount of boost or cut applied to the frequency
bands in filter bank A or B. You can use these knobs to compensate for the reduction in
volume caused by lowering the level of one or more bands. If you use Boost A and Boost
B to set the mix relationship between filter bank levels, you can use Fade AB (see “Fade
AB slider” below) to alter the tonal color, but not the levels.
• Slope pop-up menu: Choose the amount of filter attenuation applied to all filters in both
filter banks. You can choose 1, which sounds softer at 6 dB/octave, or 2, which sounds
brighter at 12 dB/octave.
• Fade AB slider: Crossfade between filter bank A and filter bank B. At the top position,
only bank A is audible, and at the bottom position, only bank B is audible. In the middle
position, the signals passing through both banks are evenly mixed.
Logic Pro EVOC 20 Filterbank modulation
The modulation section contains two LFOs. The Shift LFO parameters on the left side
control the Formant Shift parameter, and the Fade LFO parameters on the right side
control the Fade AB parameter.
Modulation parameters
• Shift LFO Intensity slider: Set the amount of Formant Shift modulation by the Shift LFO.
• Rate knobs and fields: Set the speed of modulation. Values to the left are synchronized
with the Logic Pro tempo and include bar values, triplet values, and so on. Values to the
right are nonsynchronized, or free, and are displayed in hertz—cycles per second.
Note: The ability to use synchronous bar values could be used to perform a formant
shift every four bars on a cycled one-bar percussion part, for example. Alternatively,
you could perform the same formant shift on every eighth-note triplet within the same
part. Either method can generate interesting results.
• Waveform buttons: Set the waveform type used by the Shift LFO (left column) or the
Fade LFO (right column). You can choose from the following waveforms for each LFO:
• Triangle
• Falling and rising sawtooth
• Square up and down around zero (bipolar, good for trills)
• Square up from zero (unipolar, good for changing between two definable pitches)
• Random stepped waveform (S&H)
• Smoothed random waveform
• Fade LFO Intensity slider: Control the amount of Fade AB modulation by the Fade
LFO.