Tool to automate the insertion of volume changes among a pair of adjacent note columns.
The idea is to add a series of volume command pairs so that the volumes of the two columns swaps back and forth.
Some explanation
Suppose you have a track with two note columns.
In the first you have a full-pattern sample playing some colossal beat.
In the second you have another colossal, but different, beat.
The goal is to switch between them during the playing of the pattern, with only one column audibly active at any given time.