I haven't been to much into Cinder Audio tools but it seems it is based on FMod which might be a little too simple for research application. I worked at the Ircam, and they developed a WFS system. I think it was in Max MSP. My first guess would be that MSP would be a more appropriate solution.

I would be curious to hear other opinion.

The way to handle something like this not too far from granular synthesis.  Create an output buffer for each channel, and an accompanying temp buffer for processing.  Load your sources (files, synthesis, etc) into memory. For each iteration of your buffer (which is generally not tied to frame rate), copy a portion of your source buffer into your temp buffer.  Process there and mix the values of the result into the appropriate output buffer.

I didn't know about Ircam's WFS system; I'll have a more thorough search. There is also The Game of Life project (http://gameoflife.nl/) which uses Supercollider to apply the WFS technique at their system, and the SoundScape renderer (http://www.tu-berlin.de/?id=ssr) developed at TU Berlin and built on C++ using the Standard Template Library; I'm sure there are more. By using MaxMSP or Supercollider I could achieve this really faster, but the reason I want to try C++, is I think better communication with the hardware could be achieved, avoiding possible glitches when using many channels and moving virtual sources; please correct me if I'm wrong.

letsgooutside your suggestion using FMOD this way, seems nice, athough I can't say I know exactly how to implement it, but for sure is more than enough as a starting point; if you could also point me some examples that use this in some extend it would be great, but if not, I'm sure I'll manage it somehow. Just for clarification, are you saying that this way, I could use as many channels I want (more than 128) on real time, whithout any limitations? 

Here you can find some informations on how they do that.

Be cautious with what I say but I think as Max MSP is written in C/C++ the performances should be good. But I guess you would have to write some externals yourself for this kind of application.