full duplex sound card dirve

is anyone working on full   duplex drivered for fbsd and soundcards. half the 
apps I use say the sound is only half duplex.  like kphone wich  we   are 
porting and    cpphone   and a few other     including asterisk0 pbx  look at 
te sound card and report it as half duplex. 

I just think its time we get uptodate with full duplex drivers.  I my self am 
new to c/c++ I will help where I can but     have no idea where to start..

RIch