Digital BW, The Print

Hi all

Does anyone have guidance on when to use a "buffered" or "unbufferd" 
matt board?

Today a person at "Light Impressions" told me to use a "Non Buffered" 
matt board for both digital pigment or dye ink prints.  In one of 
their catalogue advertisements on page 10 they say to use a non 
buffered board for albumen, dye transfer or chromogenic prints yet 
other advertisements in their literature shows color prints in a 
buffered matt board.

Any help would be appreciated

Bruce