Thanks, folks. Kenny, not sure how much time I'll devote to Pure Music at this point. With the last version update, my 5 year old Mini evidently has borderline capability of running PM and iTunes without having loud blasts of static take place concurrent with CPU activity spikes. And when I say loud....I'm lucky the speakers survived intact. Went back to the prior version of PM w/o problem, and decided to look around to see what was available. Easy enough to change the upsampling, I suppose. I'll also take a look at the Audirvana Plus.
BitPerfect for Mac vs Pure Music
I just installed BitPerfect and began using it. Have been using Pure Music up til now. In my system the BitPerfect has revealed a startling layer of detail I've not heard before with my music. Mids, seem a little harder, tho not harsh as when using iTunes alone. Pure Music is easier on the ears to a small degree, but seems muffled by comparison. I understand all our results may vary, but I'd appreciate hearing your experiences and thoughts regarding this software. Its native file format automatic switching is a nice feature....but worth its sound?