Yamaha mt-1x ユーザーズマニュアル

It’s now time for the mixdown. Often called “trackdown”

or “remix”, mixdown is when all the four recorded tracks
are mixed to achieve a certain sound’ balance in level,
effects, and stereo positioning, and then recorded onto
one side of a cassette tape in mono or stereo. This tape
is the final “master”.

— Signal Path During Mixdown —

In this next step, the instruments are “put in their place”
in the stereo sound field, and a slight amount of reverb
will be added to the vocal track with the REV7.