I have seen some QR codes that, when scanned, play audio, and it occurred to me that this adds a really exciting dimension (and modality) to the potential uses of QR. Think of it- you could create QR codes that will play verbal directions, informational material, even the students' own oral language (descriptions, storytelling, functional narration of a school tour or rationale for their art/writing project, etc).
So, though I am sure there must be other ways of doing this, one simple way I found is to use Record mp3. This simple site uses a Flash-based tool (so, you will need to use your computer and NOT an iPad to access it) to let you make a simple recording. You will want to make sure your Flash is updated or you may have trouble or distorted audio.
It even tells you how right on the site:
Once you have recorded and saved the audio sample, the site gives you a link. From what you know about QR already (I hope a little bit, or you'll want to go to my series, read about it and watch the video tutorials), what do you do next? Go to a QR code generator such as Kaywa, copy and paste the link from Record mp3, and you have a QR code that plays audio when scanned. Try using the app Scan to access mine below:
Now, go have fun with audio QRs!