Well, yeah. I think we’re getting into the realm of the theoretical here for what’s essentially a technique designed to practically speed up mixing and help with decisiveness, but if you have a drum kit that’s been recorded in stereo, how could it be any other way? You hard pan the overheads, and you’ve got a phantom image It might be wide or narrow, it depends on where the mics actually were placed. You’d have to go quite far out your way, and really mess up the sound, to have hard panned overheads/ rooms that don’t have some element of phantom image.
Then, of course, there’s other examples like a stereo pad sound, or a piano etc. In those cases, you have options in a typical rock/ pop etc mix. You could pan them wide, you could have one C and one hard panned, you could collapse them down to mono and hard pan… choices. But most of the parts will be mono tracks - vocals, guitars, bass, brass, whatever - in a pop/ rock/ metal context. Pan them hard, or keep them central.
As I say, I tried it for a while but did ultimately start to soft-pan again, for me it was really just a way to get into the habit of using the full available width of the mix.
The thing about soft panning, is that if you feel like your mix needs to be mainly soft-panned, that, say, a trumpet part at 30% left sounds better than 50% left, or that something hard panned sounds wildly out of place, I think it’s possibly you’re worrying about something that doesn’t actually matter. Because what if the listener has speakers that are really close together? Or the mix is collapsed to mono? Or the speakers are really far apart? What does 30% or 50% really matter out in the real world where almost no playback system is ideal?
People say that hard panning sounds weird in headphones, but honestly the only time it’s ever bothered me is when something’s hard panning and there’s nothing in the other channel at all. That’s quite easy to avoid. There’s also the restaurant scenario where the L speaker is in the dining area and the R speaker is in the reception, but honestly, call me extreme but I’m not going to pander to those audio terrorists!
These days, I’m happy to hard pan backing vocals, guitar parts, extra percussion etc, quite often I’ll soft pan less important stuff like pads, or soft pan in a verse to give me some extra room to explode into a chorus. Sometimes I’ll leave the soft-pan position for some new element that doesn’t arrive until the final chorus, so that the mere fact of its arrival in a space hitherto ignored is a novelty in itself. Quite often I’ll soft pan mono reverb and echo returns, too. And, of course, when stereo reverb is used it usually has a phantom image across the stereo field.