Time to play it unfair!
XeO3 will play SID music and native TED sound fx in the same time, and you'll get a real arcade game feeling overall!

In the game's frontend you can choose your audio configuration, mixing TED and SID stuff at your best to take all the possible from your hardware. There should be a good chance to have frequency converted music through TED device.

SID music plays from a Plus/4 via SIDcard, a well known hardware addon that plugs an 8580 SID chip (newSID) into the expansion port.
At the moment, I composed the SID tunes and fx, with my wonderful copy of SidWinder V01.23 running on Plus/4 (coded by TLC/Coroners, based on the Taki/Natural Beat original C64 version; see figure on the left).

Believe me when I tell you it's hard to fit the intro tune, the ingame soundtrack and a couple of derived jingles (end level and game over jingles) in 4 Kilobytes only, but I managed to do it for the first two levels, and it worked with decent results.

All the game's music can be heard in streaming with the XeO3's blog.radio. Click on the icon here to play all of them.