In preset No. 128:048 (the Orchestra Kit percussion), the lowest two pitches that have sounds associated with them are 27/D# and 28/E. The sounds, from the "Orchestra" instrument, are supposed to be those of a closed hi-hat and a pedal hi-hat, respectively.
While they sound as expected in the "Orchestra"instrument, in the "Orchestra Kit"preset they are overlaid with a very loud, very different sound from the "Misc. Percussion" instrument, and thus MuseScore's playback is affected.
I understand the SoundFont is under Michael's custody, so I'd appreciate it if he could look at this.