What does he mean by "beating"? If you listen carefully, there's an interference pattern in the sound where the slight difference in vibration frequency (the pitch you're aiming at) s reinforcement and cancellation in the soundwaves. That comes across as a surge in the sound, and indicates the tuning is nearly complete - you're aiming to get rid of it completely.
1:12 - “That’s in tune.” Well, in tune enough for folk music!!
What does he mean by "beating"? If you listen carefully, there's an interference pattern in the sound where the slight difference in vibration frequency (the pitch you're aiming at) s reinforcement and cancellation in the soundwaves. That comes across as a surge in the sound, and indicates the tuning is nearly complete - you're aiming to get rid of it completely.