I've been using an old SignaLink plus for ages and recently with FT8. Wired to the ACC input, using the ppt derived from the SL to key the 2000 at the ACC. But lately I've been having trouble with my audio input. Several years ago I was having this issue, the audio from the program is clean, but feeding it into the ACC input produces a crap signal and the power level goes all over the place. I did a bunch of resets on it before and it cleared up, but now it's not. I dug into the SL and turned up the audio into the 2000. It made the signal clean, but at the expense of the ALC going about 3/4 scale. I need to get a local to listen/decode my signal to see if it's distorting. It sounds clean on my other rx but it's hard to decode your own signal while transmitting Unless I use another computer. In the past I would feed the audio into the mic input and it was clean there so I thought there was an issue with the ACC input and was about to send it in, but I reset it about 5x one after the other and it cleared up, but it's not now. I put the same audio signal into my old FT757GX and it sounds clean and steady PO. It may be time for a new transceiver, but this one does everything I want except with this digital issue. I was thinking about trying another type of interface. I could just drive it directly through some isolation transformers I have but where to derive the PTT? The CAT will not operate the PTT with the ACC input. I could revert to audio into the mic and use vox, but that's a pain when using other modes too. Wait. I just checked it out and now it's working fine. Something is erratic here. I've been noticing it's been going in and out lately and I thought maybe it was some sort of ground loop. Anyone with a better idea? Opps I forgot, the ALC is still up about 3/4 scale. So when I reduce the input level for no ALC the distortion comes back.