There is program called VAC (Virtual Audio Cable) version 4.9 which will connect your sound card in and out without any physical cables involved. I use it on my Flex Radio 5000A which is necessary for digital modes. There is a charge for the VAC ($30) but well worth it, not only for ham radio but many other applications such as Skype, recording audio etc. Just GOOGLE "VAC 4.9" for information. If you run Vista 64 bit, you have to defeat the "Signed Driver" requirement.