Agree ++ with Wheat's and Marc's comments here. It's something more on the factual side rather than opinion side to me - yes an external audio unit can improve over a typical PC sound card experience.. I add some reasons below because I understand there will be plenty who will faithfully state what lovelovemale did - and they're not wrong - just they are also not right for a lot of us, possibly even most with PCs running Win or *nix.
You Mac guys - you you... ;0)
It is not a one-size-fits-all type of thing but a high probability there's good cause for anyone wanting better sound to go check out an external audio unit. I estimate OP would benefit.
Ghost of Qexl Past wrote:really worthwhile finding out why the audio seems so different between web demos and Pianoteq itself
Most importantly to me is, is whether we helped solve the 'bottle-neck' OP was experiencing (I thought a driver issue sounded like it), I sincerely hope so.
Then only after that, external audio would be the secondary consideration I'd say.
If OP is wanting to consider an external device, 100% yes, given the quality of keyboard used and obvious desire for better sound - and I think there are clear advantages to outboard units, even for many (not all) happy internal card users.
I didn't say "Get an exact unit" - again, not a one size fits all thing - I basically recommended to begin the search and hopefully OP will know himself in short time what to look for - I have faith in that.
Maybe I should point out some reasons an external audio device may be favourable:
1
Save some CPU - the box does some of the processing yeah!. (indispensable)
2
May sound better than many standard laptop sound cards. (yes for me)
3
May be more stable too. (very much so in my case, less crashy doing load heavy things)
4
Allows recording at higher specs (if you choose a device which does this - and not including mention of how Pianoteq can export to high res - maybe you'd like to hear it back at that same resolution and in real time? without waiting to take it to a record label to make a master or without fudging it through your sound card's DAC algo. which can be like dusting it with heart attack levels of sugar or inviting a visiting group of friendly Daleks to mumble and hum in the background of all your recordings).
5
Pro reasons - too many (less-destructive editing and so on)
6
Placebo may be a thing if upgrading for no 'scientific' reason.. but if that's inspiring, then human = happy. I'm OK with that as long as it's not total rip. There are arguably reasons and I'm happy for people to argue those things while I.. Oh, look over here..
Just hoping OP has found some relief
Pianoteq Studio Bundle (Pro plus all instruments) - Kawai MP11 digital piano - Yamaha HS8 monitors