Problem with crackling parameter , probably related to web-pd. By porting the model to javascript this should be fixed.
The RTSFX sound is not snappy enough (see sound designers comments).
Increase granularity and density of crackling and hissing would be good to acheive a more realistic sound.
Differenciate left and right channels . Two differnt istances of the same model could be sent to the right and left channels, this
would increase the naturalness of the model.
It is possible to hear a loop related to the "hissing" parameter (see sound designers comments).
Sound designers comments
The basic roar is good, however the hissing control introduces a sense of "looping". Crackling seems more random, but could have a more
"snappy" edge like wood cracking in flames. The crackling element is the least realistic.
Increase the cycle/randomness of the hissing element, add a "snap" control to introduce that sense of wood burning