Pitch shifting guitars big time. Yes or no?

Anyone can suggest a good pitch shifting plug in? I mainly want to downtune and would still like to preserve the harmonic content of it. IS default plug in in Logic 8 any good?
 
What can I say, dont sound too natural. Do you raise the pitch?
What do you mean? I used Cubase's pitch-shifter to tune down. I think it was a four semi-tones but I'm not sure. Also I made it quite a bit faster so that might have added a bit to the not-so-natural vibe.
Anyway, it's not meant to be perfect. It's just a riff I did a few months ago just for fun. ;)
 
Necrobump. Halloween is coming, right ?

I need to do this for a few tracks that were tracked in E, because it was tighter and guitar was well setup in E. Thought back then that the project would stay in E but meh... after reflexion, more bally with D and Eb on some tracks.

My point is, you have to do that let's say, and no way to re-record, you decide to pitch the DI or the sum of all guitars ?

Most importanly;
1) which setting/algo do you use in ReaPitch to bring it -2 semitons ?
2) Do you apply to the wav, then re-import/freeze the pitchshift or just have the plugin on each clip before the re-amp/amp-sim. Any difference possible in the sound ?
3) heard it could be "muddy" or a little darker, any tip to EQ the DI in order to keep the same brightness that the tunes in E will have ?

Thanks !