Hi,
When exporting a two note tremolo to musicXML format, Composer does not detect the tremolo and produces the two notes without the tremolo. This causes a misalignment since a half note tremolo comes out as 2 half notes. If this could be changed to 2 quarter notes, there would be no alignment problem and I can easily add the tremolo using the software (Sibelius) which imports the musicXML file. If someone knows another way to get around this problem, please respond.