Just FYI for those interested:
It doesn’t exactly work in Cubase 7 the way it used to work in Cubase 6.5 and previous. This is new to Cubase 7. The editor solo button and it’s behavior is now dependent on what the “edit active part” button is set to. IF the “edit active part only” button is selected, the editor solo button will now solo ONLY the active part. IF the “edit active part only” button is INACTIVE, then the editor solo button will play ALL the parts that have been selected for editing in that editor.
In Cubase 6, it didn’t work this way. Instead, when there were multiple parts in the editor, regardless of whether the “active part only” button was on, the editor solo button would allow you to hear all parts in the editor. The change probably has something to do with the changes they made in Cubase 7 to the SAMPLE editor in allowing you to have multiple samples open at once for editing variaudio data.
My understanding is that JT3Jon wants to be able to edit ONLY the active part, but ALSO wants to hear both (or all) parts he’s selected for editing at the same time when he hits play, without having to track solo things. In that case, this will not be possible in Cubase 7. Unfortunately you’ll either have to turn off the “edit active part only” when you want to hear the parts open for editing in context with each other, OR you will have to track solo stuff in the project itself during your editing process.