att.midiInstrument/@midi.instrnumCaptures the General MIDI instrument number. Use an integer for a 0-based value. An
integer preceded by "in" indicates a 1-based value.
att.midiInstrument/@midi.patchnumRecords a non-General MIDI patch/instrument number.
att.midiNumber/@numMIDI number in the range set by data.MIDIVALUE.