Questions regarding mono / stereo during mixdown


I've been making a lot of super layered sounds recently, being quite militant about the m/s separation for certain layers, (sub and lower mids in mono, upper mids and tops in stereo).

I generally group (bus) these channels together and apply some processing to the group 'master' channel. That got me wondering about stereo effects on a master channel full of mono channels...

Doesn't it negate the m/s separation in the first place?


Posted 2018-01-05T07:50:38.233

Reputation: 11



It depends on the effect, but probably yes.

If your effects are all true separate stereo processes with no time-shift, then no; but consider that even a simple true stereo echo, set to provide different repeat delays left & right will return differing amounts of bass to left or right depending on if the repeats at any given time are in or out of sync.

Anything else, mono in/stereo out, or any kind of smear effect, then yes.

You can very simply fix the whole lot, either at bus or master with a low frequency stereo to mono control. Google "vst mono bass" for a selection.


Posted 2018-01-05T07:50:38.233

Reputation: 5 764

So doesn't this mean that when a mastering engineer uses stereo processing on a track with mono channels he is also doing the same thing in negating the mono separation? – GavBeard – 2018-01-05T08:47:05.773

"true separate stereo processes with no time-shift, then no" That would cover what a mastering engineer does. He would also be reasonably likely to use some kind of bass/mono process, if he felt the track needed it. – Tetsujin – 2018-01-05T08:53:10.617