Why was this taken out of the X series of Sonar??
Few things have this classic sound and are this usable...hmmm??

I have Lexicon Pantheon reverb working in Sonar X2a.
It was included on the Sonar 8.5 discs.
If you've joined Sonar late, you may not have that.

The terms of the licensing agreement with Lexicon were obviously restricted. I have no inside info, but I am very familiar with licensing agreements. Basically, Lexicon agreed to license the program for either a limited time or tied it to specific products. Either side may have decided it was no longer to their advantage to continue the arrangement. The fact that Lexicon includes Cubase LE with it's audio interfaces and a hardware locked version of pantheon le may have something to do with tied being curt with Cakewalk. If you have 8.5 you can install just the Pantheon reverb. I ran it in X1 for awhile but weened myself off it and since I am trying to eliminate 32 bit plugs. I find Breverb to be a more than suitable replacement. The DSP fx loss bothered me more than losing pantheon.