Well, there's the "ambient mix" of ToD on flip of Perp Dawn single I have (just Ultrabass II on the one side, ToD on the other).  Cover has large OrbInDub in Ultraworld font on front, and "remix" on the back.  I also have the regular Perp Dawn 12", which was much cheaper but found it later!
 
So, confusion is easily justified, even beyond musical similarity that you note!

T
-----Original Message-----
From: orb-bounces+timc_orb=charter.net@mailman.xmission.com [mailto:orb-bounces+timc_orb=charter.net@mailman.xmission.com] On Behalf Of David
Sent: Tuesday, January 25, 2005 10:57 AM
To: What were the skies like when you were young?
Subject: Re: [Orb] Question

woops, that's what i meant... perpetual dawn, not towers of dub.  they're both heavy on the dub, and song names never stick inside of my brain.
 
 

 ----- Original Message -----
From: Tim C
To: 'What were the skies like when you were young?'
Sent: Tuesday, January 25, 2005 1:39 PM
Subject: RE: [Orb] Question

One prominent use of the sample is on Perpetual Dawn/Ultrabass II mix.  This is fairly easy to find - check Ebay etc.  When they played this at Cydonia/San Fran show it was INSANE.  So, I'm pretty sure that's the one you're after - it's easily one of my favorite Orb tracks/versions.
 
T