Ref: sikhawareness
Va Va Da Abhyaas Nabhi Ch Karo
Reference:: Sikh Philosophy Network http://www.sikhphilosophy.net/sikh-sikhi-sikhism/768-say-waheguru-waheguru.html
(Doing Simran of Va Va on Nabhi/Navel )
Hi Hi Di Awaaz Hiradaie Ch
(Doing Simran of hi hi on the heart)
Gu Gu Kant ch Karo
(Doing Simran Gu on the kant/near throat)
Ru Ru Di Awaaz Mastaak mai Ratan Kartaie Hoye Birti Kou Nirgun Atma Mein Lin Kar Duo
Reference:: Sikh Philosophy Network http://www.sikhphilosophy.net/showthread.php?t=768
(Doing Simran Ru Ru on the Mastaak/third eye)
So its a cycle - Va ( on Nabhi) Hi(on heart) Gu (on Kant) Ru(On Mastak/third eye).