It has just come to my attention that SmartSound has released a new update for their QuickTracks for Premiere CS4. It's now on their site, HERE.
Note that the original plug-in for previous versions of PrPro (CS3 and earlier) and also most versions of PrE is there too.
If one needs a bit of background on SmartSound, this ARTICLE might give them some tips.
Also, since SmartSound's Sonicfire 5 plug-in for FCP (Mac only) has been released, there is hope that this wonderful program will soon be a plug-in for PrPro too!!!!