This is one of LilyPond's regression tests. (http://lilypond.org/doc/v2.12/input/regression/74/lily-c64147c6.ly)
Some changes before 2.13.53 cause all midiInstrument changes to be placed on midi channel 0. This makes the instruments all sound the same in my midi player (and according to my understanding of the specs) but I also got a report that "it works for me". Output from two recent versions is attached. Bug, or no bug?
midi-volume-equaliser.53.midi
Description: MIDI audio
midi-volume-equaliser.48.midi
Description: MIDI audio
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