"The violin and oboe provide substantial musical energy above 40 kHz..."

Since I play oboe I guess I can comment on this point. I must say that for the the oboe to be reaching into the 40kHz range, you would likely be playing in the 3rd octave B flat and greater range. Correct me if I'm wrong, but that seems more in the range of the piccolo. Fortunately, most music for oboe is not primarily written in the 3rd octave. Plus I can't really recall the last time I experienced "substantial musical energy" coming from an oboe. A trumpet or piccolo maybe, but the oboe doesn't have quite that amount of projection. Just thought I'd add my $.02 from my 11+ years of playing the instrument I enjoy so much.