Welcome to the community and thanks for posting! Looks like you’ve made some great progress and put together a great looking dashboard so far!
I assume the physical buttons on the tablet aren’t easily accessible and you are hoping for ‘soft’ buttons (eg. tiles on the dashboard) to control the tablet’s volume?
@Ben_Iffland was interested in the same thing and was looking at building a Custom Tile for it. Not sure what the result of that was?
SharpTools depends on SmartThings getting the status updates. So if SmartThings isn’t getting reliable status updates, then SharpTools won’t either. Is Twine Labs an official SmartThings integration or a community supported one?