Webcam Settings
Finally I found an app to control the Logitech c910. I dont know how I missed reading anything about Webcam Settings and finally found it on a Google search. The program is easy to understand and run. The only problem I had was that ScreenFlow (4.0.2) refused to recognize my settings change. I emailed Mactaris and within 15 minutes received an answer. Actually I think it was about midnight Taiwan time! I was told to go to preferences and set "Write every setting to webcam" at 0.5 seconds. The suggestion worked, ScreenFlow now accepts my changes. Thank you Mactaris.
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Webcam Settings