[WT-support] Interface

[Alfredo Vélez WP3C]

I need to know which are the interfaces that I need to connect my MFJ-434B &
MFJ-432 to the computer, to transmit with the F Key. 

Here I see how to do it, but I’d like to know if it is for sale already
done.
 
As well how to do it among the sound card of the computer. Thanks

Alfredo Vélez WP3C/NP4DX
Skype: wp3c.pr
e-mail: mailto:wp3c at aol.com
Web: http://www.wp3c.qth.com/