The visual effects of electronic feedback became a focus of artistic research in the late 1960s, when video equipment first reached the consumer market. (en.wikipedia.org)
Not only does it have variable speed, it's also equipped with electronic feedback that delivers maximum performance no matter how you're using it. (geekwrapped.com)
If the on - site observation is not an option for any reason, the participant will be asked to video a lesson and send it for electronic feedback. (coloradoleague.org)