A while ago tjcombo posted this image of the spectral plots of various instruments playing concert Bb, as given by the freeware programme Audacity. Well, I downloaded Audacity, got it adjusted to what I think are the same settings and tested it on my menagerie. Same concert Bb, all at similar volume and same mouthpiece (DW 2W). Surprised (a bit) at the differences. Severinsen: Sovereign Studio 6335HS II Wild Thing Does anyone have the faintest idea what sort of conclusions can be drawn from plots like these. Gut feel is that any peaks below -48dB and beyond 10,000 Hz may be irrelevant. But I can't help sort of liking the look of the plot for the Wild Thing. I am getting on pretty well with that instrument at the moment.