What type of hub are you using? In theory, something like this could be used to control devices from a smart home hub, but it would need to be customized to call the relevant API.
A community member put something like this together so they could control multiple SmartThings lights at once. In theory, that could be modified to control volume instead.
There’s also a few relevant feature requests that you might want to cast a vote on (and reply with your use case to bump the thread):