GRC General Comment & Question

[GNU Radio, the Free & Open-Source Toolkit for Software Radio]

Good morning Marcus, and to the other erudite, frequent contributors to 
this e-mail list.  I'm far from a subject matter expert on the GNU Radio 
Companion (GRC) but consider it to be one of the best examples of a 
user-friendly, mouse-driven, object-oriented programming environment.  
My hat's off to its original creator(s).  Oh yeah, and the price is 
right ;-) The number of devices/tools available right out of the box is 
quite impressive IMO and the fact that GRC generates executable Python 
source code is a bonus.  My question is how relatively difficult is it 
to create a new device (USRP, filters, modulators etc) that can be 
dragged to the GRC work area?  Thanks for your time and comment.  VTY,

J.B. Wood