hi Bert,
you have a button on your keyboard called "touch" turn it on and off to see what it does.
Now turn it on and press the Direct Access and then pres the Touch button.
See what you like most, soft-medium-hard.
Once you have chosen one for the time being under your screen there are little numbers 1 to 10.
Exit everything to see your main screen.
Keep pressing number 6.You will see that now the Right one Voice is from volume 100 to volume 127.
Everything on your keyboard has it's own volume(voices,style parts,midis)
The disarable "voice" volumes for each song you can save them either on the OTS either on a Registration.
Let aside for the time being how we can change things on a style and in a midi song and focus on voice edit-saving styles with OTS-registrations.