Recreating original sound is extremely difficult and has a more limited interest in providing equivalent emulation.

There is in fact a project in active development that tries to emulate the MT-32 in software (usable on Linux/Windows): munt

You still need the original MT-32 ROMs though, which might be under copyright in your country. You can extract them from a MT-32 unit or from google. :)

In my opinion, it sounds pretty good, although its been a while that I've played around with it and I've never actually heard a real MT-32... To anybody who owns one: Does it still work through e.g. DOSBox or are there occasional hiccups with games? Is there other fun stuff you can do with such a unit besides games (e.g. interesting MIDIs)?

If you're looking for a usb flash drive with write protect switch to carry around in your pocket I can recommend the Victorinox Flash series of (tiny) pocket knives. Quite handy to have with you as they come with flashlight, ball point pen, scissors, and knife (very small but nice e.g. for opening packages). The flash drive can be easily detached and the whole thing is very sturdy in my experience!