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由 goldie 发表于 Aug. 18, 2014 ·

googled "how to learn recorder", 7th hit was www.tarleton.edu/~boucher/RecorderLesson.PPT, this add-on opened sadly some gibberish :(

作者 Adon (开发者) 日期 Oct. 16, 2014 ·

I clicked and got redirected to below:
https://docs.google.com/viewer?url=www.tarleton.edu%2F~boucher%2FRecorderLesson.PPT

It looks alright to me. Was it due to other issues like unstable networks?