Mike Thornton over at Production Expert just published a roundup of tools for dealing with stereo files that aren’t actually stereo — the dual mono problem that wastes disk space and CPU in sessions everywhere. MonoMate made the list alongside two other tools in the space.

It’s a solid write-up of the problem itself, and if you’ve never thought about how many of your “stereo” files are really mono signals in disguise, it’s worth a read.

What Production Expert highlighted

The article walks through three standalone tools that detect and convert dual mono files: StereoMonoizer, MonoMate, and Channel Utilities. Each takes a slightly different approach, and Mike gives a fair breakdown of what they do.

For MonoMate specifically, the article covers the sample-by-sample channel comparison, support for both interleaved and split (.L/.R) files, and detection of edge cases like phase-inverted dual mono and silent channels. These are the cases that trip up simpler detection — and the reason MonoMate exists in the first place.

Where MonoMate fits

If you’re comparing the three tools in that roundup, here’s the quick version:

MonoMate is $29 for a two-machine license, runs on both macOS and Windows, and catches edge cases that basic L/R comparison misses. It was built by an audio engineer (me) to solve a problem I kept running into on real sessions.
StereoMonoizer is $49 and has been around the longest. It recently shipped an update for Apple Silicon compatibility after a long gap without updates.
Channel Utilities is free but Mac-only. If you’re on a Mac and want a no-cost option, it’s there. If you’re on Windows, it’s not.

All three solve the same core problem. MonoMate is the most affordable paid option, the only one that was cross-platform from day one, and the only one with polarity-inverted dual mono detection — which matters if your files ever end up in a mono playback context like broadcast, phone speakers, or club systems.

Read the full article

Check out the full piece on Production Expert. Mike does a good job laying out the problem and showing why it’s worth fixing, especially if you’re working with large sessions or managing SFX libraries.

And if you want to see what MonoMate finds in your files, the free trial runs the full analysis — monomate.app.