@vdurhhe, QT doesn't record system audio. And I suspect it tries to filter anything that goes over the internal speakers. I usually record using my external speakers.
I've recorded numerous videos with Quicktime capturing the audio from my MBP's speakers and it's fine. Just find a quiet room, crank the volume, and go for it. Once you're done CMD+T opens the Trim menu and you can edit the video to chop off the beginning and end.
our timeline accepts keyboard focus and will read out the time and text to a screen reader. I do need to log a bug on the "precision" of the time being voiced though. Not sure a screen reader user really cares about the time of day when the time axis is only being shown at the week level - http://www.oracle.com/webfolder/technetwork/jet/uiComponents-timeline-basicTimeline.html