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The Zello Android app has a habit of keeping control of the PTT button in the background, even when its been told not to. This can cause problems if you use a second PTT app (like Teamspeak).
The problem is fixed by changing the mapping for the PTT button. The following will fix the issue.
That should be it. Zello PTT will work when Zello is the active app, and you can use the PTT button in other apps when Zello is in the background.