On my current dance track mix I used the haas effect on a sustained "cyclic" organ sound,
which sounded awesome in stereo but really weakened it in mono. (I used the haas effect on
many other sounds as well, but this important lead sound suffered unacceptably.) I read up
on and tested different battle tactics for better mono, such as different delay times or
adding pitch-shifted delays but nothing seemed to work.
I finally got
acceptable results by mixing in a multed version of the organ in the centre, and
re-balancing everything by slightly lowering the centre volume and also lowering the
volume slightly on the channel with the haas effect. The stereo effect is slightly less
impressive, but the mono sound is much improved.
It's probably not news for
most of you but hopefully it'll help someone!
I found some interesting thoughts about the haas effect on different types of sounds (futureproducers.com)
, and also an interesting discussion with
contradictory opinions about mono compatibility importance for today's dance music (gearslutz.com)