The AdLib card is supremely unsuited to generating waveform sound, so the sound may only be slightly better than the internal speaker driver. Like the speaker driver, the AdLib Waveform driver plays exclusively, so Windows will not run programs or respond to the user while sounds are playing. Unlike the internal speaker, you hopefully have your AdLib connected to nicer speakers.
This driver is ONLY a waveform driver. To get MIDI sound from your AdLib, use the AdLib MIDI driver that comes with Windows. They can coexist but you can't play waveform and MIDI sound at the same time.