This is actually sort of two questions. See, there's this particular synth sound that I've always loved in some early 80's pop (not synth-pop, more like in that sort of post-funk disco/electro grey area) and that I also hear sometimes in Les Rythmes Digitales and Chromeo songs. The sound is really interesting because it has a cool vibrato in it.

I'd really like to know what synth that is, but since I can never find people that both know synths and have heard the same songs I have I bet I'll never know.

More realistically, can anyone tell me, in general, how I can produce vibrato in synths? Do I mess with the LFO or what? I'm thinking about a sound that starts out clear and then gets vibratey after a second or two, just like how someone singing would produce it. If you need a specific synth to explain it on, how bout the Imposcar? I have that demo, and I think the OSCar might actually be the 80's sounding synth I'm thinking of.

(If anybody could help me figure out the actual synth I'm hearing in these recordings is that would be totally awesome too. I'll try to find more songs, but if you've heard Chromeo then I can tell you exactly where the sound is on a specific tune right off the bat)

That's right, LFO to Oscillator Pitch.
Personally I'd go with a synth that can do "fadein time" for the vibrato aswell.
Which could be done with Envelope to LFO depth.

-Blue Days

ImpOSCar is the perfect synth for you to create vibrato (LFO delay is one of the things too many VSTi's leave out IMO). ImpOSCar has a great LFO delay that is smooth.

For a good vibrato you choose either the triangle or the exponential LFO waves, turn up the LFO->pitch mod knob and use the intro knob to apply the vibrato delay. If you want a little more movement and realism, then you set the LFO to internal clock and free-running, then on the midi cc edit page you set your modwheel (cc#1) or whatever to control LFO rate. That way you get a smooth vibrato being introduced by the Intro, and you ever-so-slightly increase or decrease the vibrato rate with the mod-wheel.

It's a bit over the top, but great for those vocal type patches that the OSCar is so good at - especially as a real voice will never keep the vibrato going at a perfectly even rate.

Another synth that's great for vibrato is Crystal. With that one you can use a sinewave LFO to affect pitch, assign an envelope to control LFO depth, then assign another envelope or even another LFO to subtly alter the LFO1 rate.
i.e
LFO1 -> pitch
Envelope1 -> LFO1 amount
LFO2 -> LFO1 rate (or envelope2 -> LFO1 rate)

Very 80s

Just wanted to say that my lil synth can also do delayed Vibrato by depth modulating an lfo with an envelope

www.majken.se/subduer.htm

/Majken