Thanks Andy,
I'm struggling to find the cause of this and it has nothing to do with your songs. I've put some 'crash capture' steps into the transpose button. This will be in beta 10 (in addition to your recent request).
When it is live can you test the transpose feature again. Firstly though, look for the OpenSong/Settings/fileActivity.txt file on your device, and delete it. This is a file the app uses to keep a record of some of its important activities to help with troubleshooting (normally errors creating or reading song files). Start the app and try the transpose feature. Hopefully it doesn't crash but will write any issues it finds to the newly created fileActivity.txt which you can email to me.
I'm hoping to have beta 10 ready tomorrow.
Gareth