One of the remaining big structural to-dos for MNX is defining how to encode transposing instruments. And closely related is the need to encode how score-vs-part differences are encoded — such as ...

A short and clear description of what the bug is. Bass Tuba (treble clef) Bb is missing in MS4 instruments. Should be included as transposing instrument. Bass Tuba Bb is missing in MS4 instruments.