Regarding DaVinci Resolve, we’ve actually had huge problems with it when working on a series of promos this summer. It refused to export in stereo, and everything was way too high, even beyond what a simple merging of two channels would normally result in. And the nulling was all over the place. Can’t remember exactly what it sounded like anymore other than distorting to hell, but the director I was working with ditched Resolve altogether and muxxed in After Effects instead.
That program has a great possible future, but it’s not there yet regretfully. At least not for us here.