You probably had the ''loudness'' button toggled on. I was playing violin at the time so the twiddly keyboard part caught my ear. Listening to it again, for the first time in I don't know how many years, the other day I was struck by the classical harmony nature of the whole.
To me a driving bassline is one where the bass asserts the 1 dead on and doesn't often stray far from the other beats while whatever goes, goes for the rest of the band. None of that going on with that tune.