you're missing what i was talking about. with electronic stuff like that, it's not a big deal, but with live music, things are different. d minor is an awesome range for everything in the orchestra because of where each note sits on the instruments. for example, in d minor, f is the third (lowered from f# for the major). that's low 1 on the e string of the violin (a really dark sounding note compared to the rest of the e string), and the d and a sit in low positions as well. d minor for horns is a minor, which means that they can yell the root on a high a, about the limit for most non-professional horn players (and soundfonts). it gives you a solid basis for drop-d in rock music, and since the low d on a bass's 5th string is about as low as most cheap headphones, car speakers, and normal speakers will go with power, it sounds the best on most radios. for trumpets and clarinets, d minor is actually e minor, giving you a solid high b and maybe even an e on the trumpet (which a good player can reach without screeching) and good range down into the chalumeaux ending on a low e. same with bass clarinet. bones and tuba have good range in both directions on d minor. it's a good range for double reeds too - relatively easy to play compared to some of the other minors.
do you see what i mean? a key 'sounding' better on instruments or vocals is relative to what tones they produce the most naturally. d minor 'fits' the most instruments the best, similar to how bb major is a good fit for most bands.
another good example is the choir i used to sing with. if we had problems dropping the pitch every time we sang a song between the beginning and the end, we'd go a half step in either direction and start it there instead (we did mostly unaccompanied music). we'd stick the pitch like we never had an issue then. certain keys just sit better.