Soldato
me too.
I have done an entire CD much the same as what you seem to have done, but I did the very same song,one that had a good wide range ofsounds from a good range of various sources, and I exported the original WAV ( 96K 16Bit ) into a number of various MP3 formats, 320,240,192,160,128,96, 64 and sure, many machines didnt seem to make much difference between any 2 perhaps, and all seemed to show a fairly large drop off from 128k and down, but all the good gear that I played them back on, could tell the difference even between 320 and 240.
opps...
p.s. im not good enough for the test
wont go near anything below 320 and yes I can tell a huge difference between 128 and 320