Apple Logic Pro 9 - Manual (Page 1115)

This creates a meta fader, with a -1- definition set to 46.
To use the alias assigner, cable its top output to the alias, and cable subsequent outputs
to the various originals that you want to assign to the alias. If you set the alias assigner’s
maximum range to match the number of originals and its minimum range to 1, you can
then connect the next cable to a new alias, and subsequent cables to originals for the
alias. In this way, the alias assigner can be used to assign multiple aliases simultaneously.
One situation in which you might use an alias assigner is when switching a delay line
alias between different originals (different delay line objects), each set to different delay
times. This method is one of several ways to provide MIDI control over delay time.
If you copy an alias, you create a new alias of the same original. If you select and copy
both an alias and its original, you create a copy of the original with its own, separate alias.
Alias Parameters
Aliases share the parameters of their parent (original) objects, but they also have their
own, special parameters.
Reference
The Reference menu is used to select the original on which the alias is based.
Channel
The Channel parameter rechannelizes all events (except fader events), leaving the alias
to the selected channel. If the Channel setting is All, existing channelized events are not
changed.
1115 Chapter 37 Environment Objects Reference