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Quick update, Teensyduino 1.58 has been released, with all the audio library tutorial examples compatible with Teensy 4.0.

The 31 page PDF tutorial has also been fully updated for Teensy 4.0, and...

Rev D2 audio shields are in stock. They shipped to most distributors this week. Most should have it in stock soon.

If you just want to get sound output, MQS is probably your best option. It's...

In the audio tutorial material, almost all of it works if you use Teensy 4.0 and the Rev D or D2 audio shield (the one meant for Teensy 4.0).

https://www.pjrc.com/store/audio_tutorial_kit.html
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