Softube came with my X-3 producer about one year ago and is still there after the Platinum upgrade, it should be in your Pro Channel. I liked it when it was functioning, worked well on bass as I recall. I was able to call it up when I switched video monitors but I would not trust it to stay throughout an entire album at this point.
Bob

DIGIBOB
Softube came with my X-3 producer about one year ago and is still there after the Platinum upgrade, it should be in your Pro Channel. I liked it when it was functioning, worked well on bass as I recall. I was able to call it up when I switched video monitors but I would not trust it to stay throughout an entire album at this point.
Bob

For some reason it's not showing up in Prochannel in Platinum or X3.  Very strange.  What's also weird is the Platinum ProChannel's (Panipulator, Bark of the Dog, etc.) are showing up in X3.

I got it back.  I found the .dll file in the C:\Program Files\Cakewalk\Shared Utilities\Internal directory, so at that point I knew it should be available to use in Sonar, but it wasn't.  So I moved the file out of the directory, restarted Sonar, let it scan and "remove" 1 plugin, then put the .dll file back in the directory and manually rescanned the plugins.  "1 new" plugin was added, and the Saturation Knob was again available.
 
Strange.  I wonder what else is missing that I can't see. Hmm...

Wow, that's good detective work! I love to mix but am not very good with computer problems. Good luck with the new processor.
Bob