Sangat jee
It is written in Bhai Sahib Randhir Singh Jees pustak titled Gurmat Naam Abhyass Kamai.
That when doing Simran, one should go rrrr with the RaRa as it digs deeper in the well of nectar.
So it would be Vahegurrroo
The above i heard from Gursikhs, they said Bhai Sahib wrote it. Please can someone shed some light on on what is written in the pustak. Page no would be good so, one could read it in punjabi too.