Cool product! This is essentially a modern take on the radioteletype [0], which is much older than dial-up modem technology. You might find it interesting to st

Cool product! This is essentially a modern take on the radioteletype [0], which is much older than dial-up modem technology. You might find it interesting to study RTTY modulation schemes if you haven't already done so. (If you do end up implementing RTTY modulation schemes, it could make the product more popular among amateur radio enthusiasts, who use similar software already [1].) [0] https://en.wikipedia.org/wiki/Radioteletype https://en.wikipedia.org/wiki/Radioteletype [1] https://en.wikipedia.org/wiki/Fldigi https://en.wikipedia.org/wiki/Fldigi