TYPE: CHOP
TITLE: Band EQ CHOP

This CHOP is a 14-band equalizer which filters audio input channels in the
same way that a conventional band equalizer uses a bank of sliders to filter
fixed-frequency bands of sound.

The CHOP has 14 bands from 10Hz to 82kHz with one parameter per band. The
20Hz band ranges from 14 Hz to 28 Hz (1 octave centered at 20Hz). These bands
may be be all shifted up or down in frequency with the Base Shift parameter.
The shape of each band filter may also be specified as a Gaussian filter
(smooth falloff, where the bands overlap) or a Box filter (sharp cutoff,
where the bands don't overlap).

The first input contains the channels to be filtered.

The second input contains optional channels called Filter Animation Channels,
that override the frequency parameters of the CHOP. They replace the control
channels in the CHOP dialog box (b10, b20...), and can be used to animate the
filter parameters over the interval of the CHOP. To override a parameter with
an Filter Animation Channel, it must have the exact same name as the
parameter's channel. To control the 40Hz band, the channel in the second input
must be named "b40".

Filter Animation Channels are evaluated at the beginning of every Filter
Chunk that is processed. As the chunk size decreases, the rate at which your 
parameters can change increases, but the low frequency sound quality degrades.
The first input and the second input should have the same start-end interval.

This CHOP can be time sliced to operate on audio in realtime. 

Parameters
Low
    Base Shift       - The number of octaves to shift            /base
		       the bands up (positive values) or down
		       (negative values). Each octave shifted
		       up doubles each of the bands' frequencies. 
    Filter Shape     - Selects the band filter type to use.
		       Gaussian produces a smooth filter, while
		       Box produces a very sharp filter.
    10, 20, 40       - 10, 20 and 40 Hz bands.        /b10, b20, b40
    80, 160, 320     - 80, 160 and 320 Hz bands.      /b80, b160, b320

High
    640, 1K          - 640 Hz and 1.28 kHz bands.         /b640, b1k
    2K, 5K, 10K      - 2.56, 5.12, 10.24 kHz bands.       /b2k, b5k, b10k
    20K, 41K, 82K    - 20.48, 40.96, 81.92 kHz bands.     /b20k, b41k, b82k

Digital
    Filter Chunk     - The size of the chunk that is processed
		       at one time, in samples.
    Chunk Overlap    - The portion of the chunk to overlap       /overlap
		       with the previous one.
    Chunk Discard    - The portion of the chunk to discard.      /discard

Local Variables
    I   - current evaluation index.
    N   - current chunk being filtered.
    C   - current channel being filtered.
    NC  - total number of channels

See also: Parametric EQ(para), Pass Filter(pass)
