I don't think its Signum either - its not really their style, but there are a few elements (the synth, and lead drum), etc that sound like the style they used. The problem with back then is that a lot of people were using the same hardware and used some of the same features - which is why stuff is so hard to identify. These days, everyone has more of a unique sound, so you can normally ID the artist straight away without having heard the tune before.
I think this is going to be one of those that is never solved