Roasting Grains Question

[JPicasso]

I've not done any AG as of yet, but plan to in the very near future.

I was reading some posts on SMaSH brewing and some are toasting part of their grain bills to get some more complexity.

If I made a hypothetical SMaSH batch with 10lbs of 2-row and wanted to toast some,
would I toast a pound or two from that 10 lbs, or take some extra grain and toast it?
Does toasting the grain significantly reduce it's contribution to the beer, gravity-wise? What effect does roasting have? Sounds like fun.

 

[Donthoseme]

The roasting of the grain will give the beer a little bit of a toasted almost nutty flavor depending on how long you toast it and will make the beer a bit darker. I have had no difference with my efficiency when doing this in some of my beers. However for a SMASH i would just use the plain malt to get a base for the hops to really show off on. That's the opinion of a hop head who uses malt as a medium to digest as much hops as i can.