Re: PIE *R .... how many?

--- In cybalist@yahoogroups.com, "Joao S. Lopes" <josimo70@...> wrote:

>
> Is it possible that PIE had more than wan vibrant sound? Was PIE *r
> securely an apical? May PIE had another kinds of vibrant, like
> uvular and retroflex R?

Are you thinking this might be one of the laryngeals? If not, what correspondences make you think there's any reason to think there might be another vibrant?