This plugin comes FREE with Pro Tools and is a real secret weapon to widen up your sound. AIR Stereo Width comes with a pretty decent preset called ‘Wider Highs’. Tweak it to Phase Mode and play around with the three frequency knobs. A little bit increasing the level can sound nice, but don’t overdo it.
Especially combined with a reverb, it’s a nice to give your sound slight stereo addition.
Cheers and have a great weekend.