The transposition feature allows you to change the key of the music to match your instrument or vocal range. Not all scores can be transposed - if the Transposition button is enabled on the Scorch or Avid toolbar you can click it to view and select transpostion options. If the Transposition button is disabled or greyed out, the score cannot be transposed.
To transpose your music into a different key using the Avid viewer, click the 'Transpose' button on the Avid toolbar, as shown below.
Select the number of semitones to transpose up or down from the drop down menu, as shown below. Once selected, the music reloads and displays in the new key. To revert to the original key, click the Transpose button again and select 'Original'.