Board Thread:Suggestions and Ideas/@comment-24191375-20140817231217

http://youtu.be/cV4MdQuRArE?t=5m23s

I think it's very possible to use the speakers of the DSi/3DS to send data to the computer. I don't know if PTC with support ultrasonic, but being ultrasonic is not required. It just needs to work, and if the audible sounds are annoying or any interference is too bad if you're using the DS speaker and PC Mic, you can just use a 3.5mm cable instead. 