Math channel node

Perform a variety of arithmetic operations on and between channels.

This chop allows you to perform a variety of arithmetic operations on and between channels. Channels of a chop can be combined, and several chops can be combined.

Unary Operations

Unary operations are performed on individual channels. Unary operations are:

Off	Don’t do anything to the channel.
Negate	Take the negative value of each sample of the channel.
Positive	Make negative values of the channel positive (absolute).
Root	Take the square root of all values in the channel.
Square	Square all the values in the channel.
Inverse	Take the inverse (1/x) of all values in the channel.

Combine Channels

Operations between channels can be done within an input or between inputs. The operations are done on a sample by sample basis:

Off	Don’t combine the channels.
Add	Sum all the channels.
Subtract	Subtract all the channels from the first.
Multiply	Take the product of all the channels.
Divide	Divide the first channel by all the rest.
Average	Take the average of all the channels.
Maximum	Take the maximum value of all the channels.
Minimum	Take the minimum value of all the channels.
Length	Assume the channels are a vector and compute its length.

Parameters

OP

Channel Pre OP	A menu of unary operations that are performed on single channels as they come in to the Math CHOP.
Combine Channels	A menu of operations that is performed between the channels of a single input CHOP, for each input.
Combine CHOPs	A menu of operations that is performed between the input CHOPs, combining several CHOPs into one.
Channel Post OP	A menu of more unary operations that is performed on the channels resulting from the above operations.
Match By	Match channels between inputs by name or number.
Align	The alignment to use when aligning channels from different inputs. See the help for the Merge CHOP.

Mult-Add

Pre-Add	First, add value to each new channel.
Multiply	Then multiply by this value.
Post-Add	Then add this value.

Range

From/To Range

Another way to multiply/add. Converts from one low-high range to another range.

Locals

I	the current index
V	the current value
C	current channel index (0 to NC-1)
NC	total number of channels

Examples

The following examples are specifically designed to demonstrate this node:

MathBasic

$HFS/mozilla/documents/examples/nodes/chop/math/MathBasic.cmd

The following examples use this node:

ChannelBasic

$HFS/mozilla/documents/examples/nodes/chop/channel/ChannelBasic.cmd

Envelope

$HFS/mozilla/documents/examples/nodes/chop/envelope/Envelope.cmd

Lookup

$HFS/mozilla/documents/examples/nodes/chop/lookup/LookupCHOPExample.otl