It's be cool if we could fiddledick with the panning and mix the tunes more than they ever dreamed they could back then.
That level of control was a possible option, but for each song or group of songs, is just for obsessives. Purists might want MONO; the stereo arrangement was how I thought it would fill the L+R spaces & frequencies.
You can also press Select (hidden feature) to hear each channel soloed. Or, Y'know, mix them in proper high-fidelity using the KSS plugins for WinAmp & Audacity.