Struggled with this... have been messing about for hours - and am now back to square one (well almost - see below) using the SBlive.
First attempt at installing the ESS alongside the Live resulted in a broken SBlive install - Device Manager reporting that the Creative card was now using ESS drivers.
I then decided to cut my losses - remove the SBlive and concentrate on getting the ESS to work. I initially got audio under Windows but no DOS drivers showing - I realised I'd used the "wrong" drivers - it was showing as a WDM card, with no DOS device.
At this stage I tried running Gods. Interestingly I got some audio/samples during the opening credits which hadn't played when using the SBlive - but no OPL3 - when I'd run it with the Creative card I only got the FM sound.
Then found the correct drivers but struggled to get them to install as Windows kept reverting to the newer WDM drivers. In the end manually specified the correct driver file which worked - I now had all the dos drivers showing.
Tried Gods again - this time only FM, nice sound but was out of time (I think because the game was attempting to play the digital audio I'd heard previously).
Then tried Day of the Tentacle. Was OK previously but wouldn't boot up at all with the ESS drivers installed. Tried Monkey Island 2 - same thing, it hung at a blank screen.
At this stage I decided perhaps the SBLive wasn't such a bad card after all! Pulled the ESS and manually removed references in config.sys and autoexec.bat
Installed the SBLive - it automatically found the correct drivers under windows but I removed and reinstalled the DOS drivers via the setup utility.
First test for the Creative card was Gods, timing issue cured, but still no samples played back in the intro sequence. FM not as nice obviously!
Following further testing it seems machine is back to normal with the Live apart from one thing - no SFX audio in Day of The Tentacle - when it tries to play back speech the game gets stuck. Previously it ran OK although it did hang once or twice towards the end of speech sections. Also it has always reported a low memory error at boot up. A test with Sam and Max hit the Road from the same CD confirms the audio is fine with that game...