Audec releases Mono, a free simple stereo-to-mono converter effect plugin for Windows and macOS.
Mono outputs the same audio from the left and right. You can select the source of output audio from the average of the left and right, the left or right input.
The plugin is available in VST3/AU – macOS 10.11 – 11 (Intel/Apple Silicon) 64-bit and VST3 – Windows 10 64-bit.
Mono is a free download; it requires a valid email address.
More information: Audec