#3
You sure? I thought my trills were reasonably good but it never sounds like some sort of pinball, arcade game.
#4
It's just a trill with a bit of a delay on it.

Use a digital delay at about 200ms and a fair bit of reverb on a clean channel, or very low gain. That should get you a pretty good hendrix tone. You can beef it up a bit using a compressor if necessary too.
#5
Anyone else have an idea of getting that sound?

Sorry to bump an old topic.
#6
Sounds to me like another string is ringing out slightly out of tune with the trill. The trill is just a trill, the other noise is him playing another note with it by accident, possibly a harmonic.