Checking Mono Compatibility
Checking your mix’s mono compatibility is essential if you plan to play the track on a club sound system (if the mix isn’t mono-compatible, playing it through a mono system will cause phasing issues). Use the Utility plug-in in Ableton to intermittently check the mono compatibility of your track as you’re mixing.
Drop the Utility plug-in onto the Master channel. Turn the “Width” control down to zero, then right-click the plug-in’s on/off button and select “Edit Key Map.” Ableton opens the key mapping section and highlights the Utility’s controls in orange.
Press the “M” key, then press “Ctrl+K” to close the mapping section. You can now switch between mono and stereo by pressing the “M” key while you’re listening to the mix.