Good audio reverb source?

audio, signal-processing

Solution

How about this one? I know you said you didn't want freeverb, but this is episode 3 of freeverb, and to my eye it looks like it has been vastly improved.

(source: soundonsound.com)

This version is a convolution reverb that supports impulse response. For those of you who don't know what that is, engineers take microphones into a space that they want to model (i.e. a performance hall) and fire a starter pistol, measuring the echoes produced. These echoes are then used to model the reverb. This process provides a very realistic reverb, that mirrors the characteristics of the performance hall.

http://freeverb3.sourceforge.net/

Problem

Is there any good C or C-like source code for an audio reverb (besides Freeverb). There are endless examples of low-pass filters that sound great, but it's terribly difficult to find source for a good-sounding reverb. Why is that? Is it a hard enough problem that the good implementations are held onto and not published?

Original source