Goi: That "boombox"'s sound quality is probably lower than the soundcard's. That's the case with my Kenwood mini-component system and my cheap-ass soundcard/
EvilDonnyboy: Not true. The feature you mention, called "multiple wave-outs", is strictly a driver feature. Think: all sound cards can play several sounds simultaneously during a game (say, motor and gunshots), so why wouldn't they do it for normal sound?
Well, games uses sound through the DirectSound API (or some extension thereof), which by definition allows for multiple sound streams. But standard programs use standard wave-out, for which the driver may or may not allow multiple streams. BTW, all WDM (Windows Driver Model, available in Win98 and Win2K) drivers support it.
To further prove my point, I've accumulated information regarding this feature on several sound cards:
Creative Sound Blaster 16 ISA
Win95 - no, Win98 - no, Win2K - yes (WDM)
ESS 1868 ISA (cheap SB16-compatible from 5 years ago)
Win95 - no, Win98 - YES (WDM), Win2K - yes (WDM)
Creative Sound Blaster 64 PCI (ES1370/1371)
Win95 - no, Win98 - no, Win2k - yes (WDM)
Creative Sound Blaster live
Win95 - yes, Win98 - yes, Win2K - yes
CMI 8738 (cheap PCI card I have now)
Win95 - no, Win98 - no, Win2k - yes (WDM)
-PJ