I currently have an Aphex 107, and have swapped the tubes. I haven't had much time to play around with it, and will still do a lot more experimenting before I make any decision, but what are your opinions on the ART Pro MPA when compared to the Aphex? Differences, pros and cons, etc. I know some people on here have experience with either one or both. I tried searching to get some more info on the ART, and found that the search engine wouldn't pull anything up. Even if I just typed in ART/ART Pro/ART Pro MPA. I know there are threads on it cause I've read some. Anyway, help would be appreciated!