The verb to "cleave" is the only word I know of that has two meanings each of which is the exact opposite to the other (well except for maybe 'sanction').  It means -

(1) to cut or separate; and
(2) to join together or adhere.

Given that this program will split some audio files apart and join others together, it seems very appropriate.

If you frequently need to split stereo wav files into mono files or combine two mono wav or aif files to stereo then this application is just what you need.

Cleaver is a PC application

Original concept by Dax Liniere

Download Cleaver
Version 2.1.0 (21/05/2021)
With new automated intelligent stereo matching function

Sound On Sound Review