Patch vfreeverb~ is a literal translation of freeverb~, and damping is just as bad as in the original. Most important is incorrect placement of the filters: after the delay line outputs. So the first reflection is not filtered. Further, the frequency range doesn't go low.
Attached vfreeverb~alt.pd is a quick fix in this sense. By the way, freeverb (the routine) is put in the public domain by the original author, Jezar.
Acreil, do you happen to have good fdn reverb algorithms? I'm currently trying to understand gverb/gigaverb but having a hard time with the code. Freeverb~'s diffusor is good, and I'd like to try this in combination with fdn. The aim is to write an efficient yet nice sounding reverb in C, for small devices like Raspberry Pi.