EMG sensors

Does anyone have any experience with EMG sensors, for measuring muscle tension? I’d like to use them to experiment with muscle relaxation. For example, a headband that emits a tone when your facial muscles are tense. I played with an Antense headset, but it’s bulky, and it generates a continuous tone whose pitch varies with the level of muscle tension. It seems like an alert-type signal would be much more effective.

I’m not sure if you found what you were looking for, since this post is a few years old, but if you are still looking for an EMG solution, I’m developing an open-source EMG sensor that you could definitely modify for your purposes. Here’s the thread: https://forum.quantifiedself.com/thread-open-source-emg-biosensor-ask-me-anything

If you have found a solution, please tell us about it!