A transposing instrument: one of the built-in names, or a spelled interval
for an instrument the table does not carry.
An interval is read in the same written-to-sounding direction as the table,
so '-M2' is any instrument in B flat and 'P8' any that sounds an octave
up. The names complete in an editor while any other string is still accepted,
which is what lets an instrument read from configuration go straight in.
A transposing instrument: one of the built-in names, or a spelled interval for an instrument the table does not carry.
An interval is read in the same written-to-sounding direction as the table, so
'-M2'is any instrument in B flat and'P8'any that sounds an octave up. The names complete in an editor while any other string is still accepted, which is what lets an instrument read from configuration go straight in.