Series creator Kenneth Johnson, in bonus running commentary for Pilot (episode 1) DVD, referred to these as "voices" or "Legeti"-style transformation sequences (similar to Ligeti lux aeterna used in Kubrick's 2001). These transformation cues seem to missing from ALL Harnell Hulk CD issues.
Watch/listen here at 02:56:

http://www.youtube.com/watch?v=DIqG3Mq-E3A

I would love to have clean versions of these, but as yet no joy. As you say, it's not on any album, even once. It is a distinctive musical moment in every episode, and it is to bad it is not represented.

It might be possible to extract it from one of the DVD sets for the series.

But not clean, I'd expect. It is never just the music. There are roars, and growls and things being smashed.....all mixed as loud as the chorus.

were there only 4 CDs released of the Inc Hulk (5 with the first collection CD)?
This serie had so much great music in it and it would be cool to have "the legeti" released as bonus cues.

I would also love to have the songs from the episode Metamorphosis :)

Oh yes, I agree.