I have worked PSK31 and RTTY with no interface for years. I have a manual PTT switch, a line out of the PC to a mic plug and a line from the headphone jack to the PC. rough and dirty, but it works. 71 countries worked so far....... so..... How much hassle is setting up a "real" interface? it would handle the PPT automatically, but is there any other advantage? thanks for your wisdom!