I know of no "hybrids", but an instance of a standard instrument being played in a most unusual way(the only one, that I know of relating to this particular type of instrument). And of a machine that was specially constructed for just one recording, and an associated instance where a loan from a bank was utilized.
In the first, during the scene in R. Strauss's opera "Salome" where she is waiting at the cistern for John the Baptist's head to be handed up to her, the strings(violins only?)are "pinched", not plucked or bowed. Begin listening very closely around 2:25 and you should be able to hear them:
http://www.youtube.com/watch?v=NI02Rj5xhFM
The machine I referred to was a "thunder" machine especially designed and constructed for employment in Solti's(with the VPO)famous recording of the Ring, dubbed the "Golden Ring". It's heard here in this video at 1:57: the one and only time a recording of it has ever been released to my knowledge, and has got to be either one of if not the loudest sound heard in any "musical" production:
http://www.youtube.com/watch?v=jcVjGBNrlCs&feature=related
The loan from a bank was that of I don't know how many silver bars from one in Vienna, for use in the same recording, that of "Das Rheingold". Its utilization was for the Nibelung dwarfs to pound away on. They can be heard here, beginning at 3:00:
http://www.youtube.com/watch?v=z-9Oml5IPT8&feature=related
Alberich