Why are there no amplitude sift keying digital modes? Or is there one that I'm not aware of? And I'm not saying Morse isn't a digital mode but Morse is hard to copy by computers. Why isn't there a digital mode that uses cw? That could have many applications like for example cw only radios could benefit with extra capability. This would also make getting started with HF much cheaper since CW only radios like qrp kits or even homebrew are cheaper and easier and there would be the added benefit of not having to learn Morse code.