TYPE: CHOP
TITLE: Shift CHOP

This operator time-shifts a CHOP, changing the start and end of the CHOP's
interval. However, the contents of the channels remains the same.

Each channel can be shifted a different amount by using the Scroll parameter
or by using the $C variable in the Start/End parameters.

An optional second input, the Start/End Reference, is used to align the
first input CHOP relative to another reference CHOP. This outputs the 
channels of the first CHOP only, and the shifts are based on the 
interval of the second CHOP. It is useful for making several CHOPs match
up to the same time.

Parameters
    Reference   - The start or the end of the channels can be used
                  as the reference position. The channels are shifted
                  by altering the reference position.
        Start Position - Uses the start of the CHOP to do the aligning.
        End Position   - Uses the end of the CHOP to do the aligning.
    Unit Values    - Determines how the Start and End parameters are
                     are to be interpreted.
        Absolute              - The Start/End parameters are
                                the actual start/end position.
                                It is used to shift the CHOP to
                                start at 0 seconds, for example.
        Relative to Start/End - The Start/End parameters are a
                                shift relative to the input CHOP's
                                start/end position.
        Use Current Frame     - Ignore the start/end parameters
                                and use the current frame as the
                                new start position.
    Start - The start of the interval, absolute or relative to   /start
            the input CHOP.
    End   - The end of the interval, absolute or relative to     /end
            the input CHOP.
    Scroll Offset - The amount to shift the channel.		/scroll

Local Variables
    S   - The start of the input clip, in samples.
    E   - The end of the input clip, in samples.
    L   - The length of the input clip, in samples.
    C   - The current channel (0 to NC-1). With this variable, channels
          can be shifted relative to one another.
    NC  - The total number of channels.

See also: Cycle, Extend, Stretch, Trim
