Hi Joeeye.
Thank you for your response. I should have updated this thread.
I have now got it working.
I do not use it to play actual music.
It is used on a sheet music app. So that when I select a particular song, the tablet sends a midi command to my sound module telling it what preset to select.
This means that when I play a song, I do need to select it from the music and the sound module, as the music app sends the command to the sound module.
Thank you for your help.