User guide

2.4. Post Equaliser Tab
Traditionally convolution reverbs provide an FIR filter for their sound modification needs. Whilst FIR
filters are linear phase and provide excellent results, they typically cannot provide modulation
capabilities as the filter needs a great deal of re-computation every time parameters change. For this
reason an oversampled IIR filter using 5-band analogue prototypes has been provided such that the
filter can be modulated, providing opportunities for a more dynamic sound.
The EQ graph handles can be dragged to change gain and frequency, and right clicked to toggle them
to enabled or disabled. The handle is shown at the midpoint of any gain and frequency modulation.
The filter is provided as a master effect and affects IR1 and IR2 but does not colour the dry path.
Level, Frequency and Type
Each filter can be controlled by gain and frequency. The filter types available depend on the filter
number.
- Bands 1 and 2 provide low shelf, low cut and peak types.
- Band 3 provides peak type.
- Bands 4 and 5 provide high shelf, high cut and peak types.
Modulation
Two LFOs are provided for modulation purposes and can be used by any of the five filter bands. LFO1
is tied to gain and LFO2 to frequency. A phase control is provided on all bands such that the phase
(position in the LFO) of the modulation can be set independently for each band.
For example, by setting up two peak filters both using frequency modulation it is possible to get the
peaks to travel up and down with each other using the same phase, or travelling towards then apart
from each other using 180 degrees phase. As the filters update with respect to the modulation they
are shown in their instantaneous modulated state in the visualisation window as it refreshes itself.