is there a big difference in sound quality between mono and stereo other than the difference in size?
If you run an actual speaker setup instead of headphones the difference is like night and day.
On my current and previous 5.1 speaker setups stereo songs come from the Front Left & Front Right (Stereo) speakers by default and can be put through Stereo Upmix.
That upmix feature lets the music engulf you in sheer aural bliss as it now emanates from every direction!
Sadly though, the mono tracks will only play through the Front Center channel and can't be upmixed.
to get the SC3KU *.xa files to play in DAP you will need to hex edit them as described on the "SimCity 3000 Unlimited Music Conversion" page i posted previously.
a good free lighweight hex editor I've used for years is:
Freeware Hex Editor XVI32 http://www.chmaas.handshake.de/delphi/freeware/xvi32/xvi32.htm
Teh archived files 'drivetheory' linked are aaall broken, but teh music in MP3 format can be found elsewhere online easy enough - GoogleFu!
Yeah, that archive page is just there to prove/document that the music was given away for free.
...the SimCity.EA.com website was pretty great and full of useful information until the great culling that occurred a handful of years back.
Inside Scoop http://archive.is/EbT3y
SimCity 4 Inside Scoop http://archive.is/3PesU
Its truly a shame these knowledge filled pages are all likely lost to the sands of time...
[EDIT: fixed typos]