drsteve, you are so right about semi-pro (or even amateur) recordings being better sounding than many commercially produced ones. I recorded the Jump Blues/Swing band I was playing in with a pair of omni condenser mics straight into a Revox A77 at a live gig, and it sounds much more "alive" (in sound quality) than most of my LP's and CD's/SACD's. I used the same mics into a Teac 4-channel 2340 in a home studio on a singer/songwriter recording gig, and it too sounds great. Very transparent, with great transient "snap" and dynamics (not as good as a Direct-to-Disc LP played with a Decca/London pickup though), and quite lifelike instrumental (acoustic piano, acoustic guitar, electric guitar & bass---plugged straight in without an amp amp, and drumset) and vocal timbres.
Almost all commercial recordings are very heavily processed, the mic signal travelling through all kinds of outboard gear (mixing boards, mic pre-amps, compressors, limiters, equalizers,, electronic reverb and echo simulators, etc), to make it sound "better" (whatever that means). The mastering process used to turn recordings into playable formats involves the use of many of those same pieces of outboard gear again!
I use my tapes in evaluating reproduction gear. Everyone, if possible, should!