Tab Question

I have a question on your tab layouts. I understand the 6 strings and the numbers that indicate the frets. I also understand the various indictators for hammers ons, pull offs, etc. But I notice on the very top of the tabs there are these series of letters. H, Q, S S S S.. stuff like that. What are those letters trying to tell me? Thanks for your response.

Wait.. I think I figured it out. Half, Quarter, Eighth, Sixteenth.. right?

Vintage Guitarist

Hi all.. I'm a guitarist from Nevada USA. I've been playing 40+ some odd years. I grew up on Sabbath, Aerosmith, Led Zep, Blue Oyster Cult, Deep Purple, etc.. too many to name. I'm a local area musician and play in a country/rock and a classic rock band in the area. I found this site while searching You Tube for country licks. After looking at what you folks had to offer, I decided to join. Lots of great stuff here.. Being an old blues/rock guitarist, I rely heavily on a hammer on/pull off economy picking kind of style. But I would really like to develop some alternate picking technique. It's such a great modern sound.
So I started listening to the alternate picking lesson plan. I'm going through Kris's speedpicking lessons now. I pulled out my old metronome and installed a fresh battery. I'm ready to rock. I also happened upon Muris Varajic's pentatonic llicks lesson. Great stuff, wonderful tone..
So many things to discover here.
I played a bar gig last night with my country/rock band. I found myself becoming more aware of my picking technique. I closed my hand up, angled the pick a little, and busted out some beginner AP. It was great..
Lastly, a special thanks to Ben Higgins for sending me the welcome email.. thanks.