Could SIMON run on Nokia's N900 "pocketable computer?" It runs a Nokia specific Debian distro called maemo. The hardware is TI' OMAP 3430: ARM Cortex-A8 600 MHz.
Probably. There are KDE libraries for N900 so it should be quite easy. However, I don't know about portaudio…
Would be very interested to hear the results if you'd try, tough