I have been looking for a
long time for something like that — over a year in searching now! — and I'm pretty sure there is nothing out there for the Mac — yet.
I've been a great fan of MorphVOX (
http://www.morphvox.com) for Windows, which is better than the more popular AV Voice Changer (or whatever it's called). They also have a server-side solution (which runs under Linux), and I'm aware they were in touch with Linden Lab to do some integration of their software on the grid servers, but I'm not sure if they will ever go ahead with that — Linden Lab seems keener to have voice first, and add morphing in late 2008.
SreamingBee, the company that does MorphVOX, is rather friendly. I have patiently explained them that the Mac market has absolutely no competition in voice morphing technology; it's virgin, unexplored territory, and all they need to do is to get their fantastic morphing algorithms wrapped in a Mac OS X application (these tools do not have overly complex interfaces – what is important is the way they process the sound, not the fancy graphics). They showed some interest, asked for some more input about why they should port their platform for the Mac, but kindly explained that they have no idea how big the demand for a Mac port is. I still bought a license of MorphVOX and try all opportunities to let them know that we Mac users are still waiting for MorphVOX for the Mac. The best I can suggest at this point is that you email them telling that you're looking for a cool voice morphing application for the Mac and there still isn't any around, and that they know they're evaluating the Mac market's needs and would certainly be interested in buying MorphVOX for the Mac if it ever comes out.
I've also explained to them (that was a year ago) that SL has an extraordinary amount of Mac users (well over the average — I believe that almost 20% of all residents have Macs), that, unlike Windows users, would be "left out" of voice morphing once SL introduces that technology built-in. So launching MorphVOX for the Mac once SL opens voice to everybody could, very likely, get them a few hundred thousand licenses sold in a few days. They are still thinking about it. I guess that all what they need at this point is getting an avalanche of Mac users telling them the same. So feel free to email them and ask for a Mac port: the contact is Mark Ramirez, [email]feedback@screamingbee.com[/email]. If they don't know that there is a need for this, they will not know if they should allocate resources to developing the Mac port! (And, obviously, all their current users are indeed Windows users, so how do they know if we don't email them?)
In the mean time, there is a very complex setup that
might work on Intel-based Macs: using Windows on Parallels, installing MorphVOX there, then capturing the audio output from the Windows virtual machine with Audio HiJack and feed it into Second Life. Now this setup
almost works — there is somewhere a setting or two that I have to figure out to make it really work. So far, I've managed to capture the audio output inside Windows successfully (I can see it getting "tunneled" out of Windows) but the sound comes "blank" when it reaches the Mac part. There is something "there" but it's not sound — just internal data that shows that "something" is going on. I'm still playing around with settings, and searching on Google for more info, but I haven't found anyone who ever attempted to do this. I'll keep trying, though! Still, it's a very "expensive" setup — you need a license for Parallels, one for Windows (gah!), and one for MorphVOX (Audio HiJack at least is free) for all to work. For all of that you might get a cheap PC! (a new license Windows Vista costs in my country as much as low-end PC with an OEM version of Vista) And really, I'm not going to buy a
PC to run SL with voice morphing, when the Mac works so well with SL otherwise...