Differences between a Jem and UV (besides the extra String)
I was reading a past copy of Guitar World issue, by the time Steve Vai released "sex&religion" and it has an interview where Vai talks about the VWH. He says that, in order to keep the tuning right, the VWH has some kind of "special" spring in the tremolo so that when you bend a note, it doesn't go out of tune. Well, i believe him (although i've never played the VWH), but is this a feature common to all Jems after the VWH? And the Jem90 has it too? (i'm asking this about the Jem90 because it has many uncommon features for a Jem: Gotoh tuners, the neck...). And what about the UV777? It has the same "special" spring that keeps the tremolo in tune when you bend notes?
Also, what is the upward interval that you can get in a Jem when you pull up the tremolo? And in a UV? It is the same? And what causes that limit in the note? Breaking a string or the tremolo arm touching the body?