1. Be sure that your MusicXML file specifies one of the accepted names in the <part-name> element. You can achieve this by eithter
1a. editing the MusicXML file directly, or
1b. using capella:
1b step 1: Be sure that your capx file specifies an instrument name:
In the template system, on the Names tab, input one from the list (Tenor, Bass, Guitar) as full name. If it matches your desired name, it is fine. If not, we will change it later.
1b step 2: Be sure that your capx file is willing to print the instrument name left of the first staff:
For the first staff, choose Format - System - General - Instrument descriptions as "full description".
1b step 3: Save the file as MusicXML.
1c. using capella-scan: Place a new text element left of the first staff. It will be automatically
classified as "Voice designation". Type in one of the names (Tenor, Bass, Guitar). Save the notes as xml.
2. Read the file into Sibelius - the octave change is accepted!
3. If the instrument name does not match your desired name, or if you do not want to print an instrument name at all left of the first staff: Double click the instrument name, so you get a text cursor to edit the instrument name. Click elsewhere, so your edit changes will be accepted and the left edge of the first staff moves to adapt to the new length of the instrument name.
This is due to the same Sibelius bug described in the previous chapter with octave changes. Apparently, Sibelius searches its internal instrument list, and finds an early match in family brass, with a transposing instrument in Eb. So Sibelius decides: This cannot be in the same group with Soprano, Alto, and Tenor voices, closes the bracket, and prints the part transposed, regardless what the MusicXML file has specified. We cannot influence this behaviour from our MusicXML file, neither from capella, nor from capella-scan.
The only way to work around this is the manual instrument mapping offered as second dialog box during MusicXML
import. You may have already flagged it as "Don't say this again", so re-enable it selecting File - Preferences -
Other - Show All Messages. Then you get the second dialog box, answer the question "...Would you like
Sibelius to choose the instruments?" with No, and the Instruments dialog box appears.
In the list Ensemble choose "All Instruments", in the list Family choose the most likely one, and make the final choice in the "Available" list. "Add" the items in the right order, so the will appear in "Instruments to create". You can correct that list using the Remove button. When that list contains an item for every part in your score, click OK and the import goes on.
This procedure is also an alternative method to solve the problem from the previous chapter, without changing the MusicXML file.