I would like to experiment with vocal, having different accents. Does anyone have an idea of how this can be accomplished? Any VST to apply to dry recording? Filters combination? Anything else? Many thanks for sharing information on this topic!

I think you need to define what you mean by "accent"

If you mean accent like French, Irish, Italian.. I highly doubt there is such software available, VST or otherwise. I am an audio software junky, and I have never seen anything like what you are asking for. I may be wrong, but I think the only way to get a vocal track where the voice has an accent is to record one..

Wow. This surely goes straight into my top five of most strange questions.
Would you like to explain a little? And if you mean accents of language, not accentuation of speech, I'd be sincerely interested to know if you really expect there to be a VST for that?? :o) :o)

I worked for YEARS to get a passable "Irish" accent and "Southern" US accent for some of my stuff. Heck... I've even duplicated Bronx and West Coast accents for stuff.

If this is actually about regional dialects and inflections all I can say is buy a bunch of albums where the vocalist has the accent you want and sing along with them over and over again to the point of madness and you might get close.

And if you are REALLY serious about this kind of thing sign up for an acting school that offers classes in learning accents. It is a LOT of work.

  V Vocal might be able to add some "accent" to words using its formant controls 

I could do Welsh, if that helps 

Ah man... I think imitating a Welsh accent would be very difficult.

Geordie accent? That would probably require cutting off specific chunks of my own tongue and having marbles surgically implanted in my cheeks.

I think an accent removal tool would be helpful as well!