You will hear all frequencies possible with your computer speakers. Tuning an actual piano is harder than this exercise because
the computer speakers are filtering a bit of the sound
which makes it a bit easier to hear the beating A4.
(See Learning to Tune Pianos Over the Internet) A5 will be audible. Ignore it.
Train your ear to filter it out.
Focus only on the beating of the A4. Use the A4 and A5 buttons below to focus your ear on the specific beating partials.
