Hello Glen,
I don't know exactly what you are trying to do but if I wanted to stop a noisy instrument or drum sound, I would go to and press the 'OtherParts/Tr' button (to the left of the screen just above the Help button). There are four pages here, the first page shows the immediate controls and the other three pages show the other parts used in the style/pattern. These can be adjusted to your needs and all I would do is 'MUTE' the drum or lower it's volume.
When I am satisfied I then save to a panel memory or an SD Card for future use.
Hope this helps - Audrey