Using YouTube as an example of an Apps link, is there a way make it open a search of the current song title you are in?
Does anyone know a page that has the scheme links for apps?
I'm looking for QSC Touchmix 30 app in particular.
No, there isn't an automatic way to open a specific page using the App buttons. You could put a specific link in the Notes field or a custom field, if the other app supports that.
You'll have to contact the developer of the Touchmix app if you can't figure out the app scheme by guessing.