I operated digital modes on my TS430S for several years. I used one of these interfaces. http://www.unifiedmicro.com/sci6.htm It's a typical transformer based isolator supplied as a kit. It worked well in the end but took some fiddling to get the levels right and there are a few other hassles to deal with which are no real fault of the SCI6. I took the audio out from the radio's accessory socket on the back. You need a somewhat uncommon DIN plug for that. They're available from Universal Radio. That's an output for a speaker which is not ideal because it is dependent on the AF gain control. Adding to that, the only input on my Sony Vaio laptop is the microphone input which is a huge mismatch in levels to a speaker output so I had to introduce some extra attenuation with something like a 100:1 resistive voltage divider on the cable. The TS430S accessory socket doesn't have a proper ground pin. The only ground is the outer metal shell. That caused me problems. Perhaps my socket was a bit corroded or something. I put a short ground wire from the accessory plug to the plug on my CW key next to it. For transmit, I used one channel of the A/V output of the laptop and the microphone input on the TS430S. The SCI6 has an adjustment for transmit level but not receive. I think I ended up changing a resistor value in the SCI6 to get the level down to something sensible. I think there is an audio input on the back of the TS430S intended for phone patch. Looking back now, I'm not sure why I didn't use that. After all that and careful fiddling with the Windows gain controls, I was able to get it working quite nicely. I didn't bother with T/R switching but used VOX which worked okay but you do need to be careful with unexpected sounds from the computer. I used the mic gain for transmit power control. I think that works okay unless you want to operate very low power. I usually ran at about 5 amps IC. That's about 60 watts input. I could transmit for a couple of minutes before the fan started. That was usually a sign that I had rambled on for too long and it was time to pass it back and let it cool down. You want to get the transmit audio level so that the mic gain is at a reasonable mid point for the desired output. Your levels need adjusting if you find that you need the mic gain near min or max. Trying to work a weak signal when another strong signal shows up in the receive passband can be difficult. I guess that's just how it is with an SSB width filter but I think lack of user control of the AGC tends to make it worse. The IF shift can be useful. If you have the 270 Hz CW filter then that can be good for receiving PSK and 250 Hz Olivia but it's not really much use because you need to be in USB mode to transmit. So... the TS430S isn't the ideal rig for digital modes but it's still quite usable and lots of fun. If I was starting again, I think I'd take the advice of others here and get a more fancy interface with its own sound card and easy level adjustment knobs.