Transposition #329
Description
Transposition should be a relatively simple change to implement. My thoughts are:
- A section of the top menu which has an Up or down key. That will transpose the piece into the key above or the key below
- Key classes would implement a method to calculate the new key based on its current state.
- Note classes would then implement a new method which would calculate, given it's current key, pitch value and new calculated key, how far to move its own pitch
- ToLily would then be recalled and the PDF regenerated and reloaded.