TLDR; Installed custom
Daniel K driver and registry fix (I think). No recurring issues yet.
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OK. That was weird. I downloaded the 'SBZ_CD_L13_1_01_12X.7z' and 'SBZRegFix.7z' files via
Daniel K's site. However, during the driver install, I got an error (see attached) stating that 'Installation is unable to continue...(code) I-010'. (According to
Creative, this error relates to 'missing Windows components'). I expected this to kill the installer, but it seemed to finish anyway. So I rebooted, ran the registry fix utility, then rebooted again.
I wasn't getting sound initially, so I went into the Sound Blaster Pro Studio app, clicked on the 'cinematic' tab, and was slightly horrified to see that the DTS Connect radio option was
missing. (In retrospect, this was not that big of a deal, as I could always re-install the official drivers).
According to the
Creative troubleshooting article I mentioned above, one must find an 'install.log' file before dismissing the driver installer's error message, so I set about trying to re-install the driver. Thankfully this did not seem to be necessary, as launching the Daniel K installer again gave me the 'repair' option, which seems to have done the trick. I also re-ran the registry fix utility again (and rebooted again) for good measure.
So I currently have working sound and the 'DTS Connect' option is back in SB Pro Studio. I won't know for sure whether these steps fixed my distortion issue until at least a couple of days, but I will report back either way.
Thanks.