That's a good idea; wish I could just drive over to Mesa Boogie, then again, here in London, I can just drive over to France. Back to loops: some time ago I had my 2001 Laney LC15R loop modified from parallel to series and just noticed that their latest version, the LC15-110 has indeed a series loop. They're slowly getting it. Another thing, ask whoever modifies your loop to check that your reverb send is post loop: with the Laney, that had to be reconfigured as well.

Merry Xmas.