Mixing in mono is a technique used by many producers to achieve clarity and accuracy when creating a mix. Mono mixing allows producers to detect errors in the mix, such as phase problems between different waveforms. It also helps to create a balanced stereo image, as tracks with hard curves need special care. Additionally, mono mixing ensures that the mix will sound good for mono listeners.
To get the best results from mono mixing, producers should start by adjusting the attenuation levels and using equalization to ensure that each source occupies its own spectrum. Then, they should add panoramic sources to create the stereo image. When working with voices that have a lot of vision, it is important to center all vocal tracks and mix them in mono before switching to stereo. Additionally, producers should switch to high speed bass of around 150 Hz or lower on most tracks to make room for those who really need it.
Finally, they should take their time to make sure that each instrument has a place in the mix.