www.discogs.com says...
Public Domain - James Allan, Mark Sherry, Neil Skinner, David Forbes (ex), Mallorca Lee (ex), Alistair MacIsaac (ex)
... but unfortunately the only entry for Ultrasonic is www.ultrasonic7.com,
i worked out why that was - its "Ultra-Sonic" :-) http://www.discogs.com/artist/Ultra-Sonic/ Real Name: Rodger Hughes & Mallorca Lee so they share one member. <going way off topic from here> coincedently, on my way home tonight i went via a cd store and saw a "Public Domain vs UltraSonic" mix CD. theres a couple of copies going semicheap. futher google and <plug! plug!> www.clusty.com <plug! plug!> searching led me to http://www.clubscene.co.uk/ultra-sonic/ which says Ultra-Sonic aren't no more and have a new single being released quite soon if not already. they're also doing a new years gig in Glasgow.