Supporting higher speeds, e.g. 4800 or 9600 bps, would be a big improvement for the softmodem, and possibly more reliable on certain connections (?)
There is a WIP branch from some testing that was done, but never got anything working properly: https://github.com/InterLinked1/phreakscript/tree/fast-modem
External reference: https://github.com/AonCyberLabs/D-Modem/blob/636959b37b592b87a47c6da2069149961cd70ccf/slmodemd/modem.c#L177
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