Ordered this cassette to calibrate a Pioneer cassettedeck that was clearly slowing down all music.
A random YouTube-video helped me understand the idea about using a tape like this. I recommend this video, it's not a very polished effort, but it's also not TOO technical:
https://www.youtube.com/watch?v=60dG35aJPmY
So, in Audacity on my computer I created a 440Hz test-tone (in the menu: Generate > Tone, use the defaults), played it, and played the cassette in the deck, in my case I used the sound from the Phones-out - plugged into the same speakers as my computer.
You have to irritate your family members (or neighbours) here, as you have to play it LOUD to hear the beating of the frequencies.
This is the point were you can adjust the speed on your deck. How and where depends on the deck, and more often than not, you need the service manual to find out how to do it. Check out this site if you need one:
https://www.hifiengine.com/manual-library.shtml
In my case it was a little screw directly on the motor, looking similar to this:
http://probe.com.au/ocart2/image/cache/catalog/product-180/ZTmECatyXc-DSCF5450-500x500.jpg
Of course, this is not a REALLY accurate method, but checking with my own ears, and streaming the same song on Spotify and playing it on a pre-recorded cassette, I'm more than satisfied.
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