Go for it! Sound recordings are extremely helpful. They are a fact of my life, every worship service is video/audio recorded and I learn a lot about myself as I watch it, either on playback or on the web. I use it everyday in psychotherapy sessions for myself and to train other therapists. Even a poor recording is better than no recording, you will always learn something and it seems to me that learning is what the class is all about. Anything that I can do to shorten my learning curve is greatly appreciated. My graduate students hated recording therapy sessions for critique, but I have had many, many therapists tell me years later how useful the recordings a feedback were for them. Use the technology at hand, and benefit from great feedback. I would suggest if you don't wish the feedback, Dave can withold it but that will lengthen your learning curve.