[Greenbuilding] Noise between floors

[Jefro]

Is this the same thing as (or similar to) sound board? 

We have a similar "drum" situation in the house we are building, with 
bedrooms over kitchen & living room.  We milled our own beams and thus 
have left them exposed as joists, with a 1-1/8 sturdi-floor subfloor.  
The plan right now is to put a wood floor over that and then a good 
thick rug in each bedroom.  From the bottom, between the big joists, I'd 
like to add 1/2" sound board and then exposed paneling, or something 
fancier if more time materializes out of thin air. 

However, I have zero faith that any of this is going to stop the "drum" 
effect.  It isn't the end of the world, but if there is something 
inexpensive I can use to mitigate it, I'd be happier doing it now than 
later.  How much would an underlayment help?

Alan Abrams wrote:
> Woodstalk was a high quality not-quite-structural panel manufactured (or at
> least distributed) by Dow, using agricultural waste material.  
>