Hello OMs, I use the following equipment: PC with Windows 11 Rigexpert Plus IC-7610 Vara HF 4.7.1 VarAC 6.4.15 This equipment works great under MixW and WSJT-X. I use the sound card integrated in Rigexpert for both programs. Now I installed VarAC. The PTT and CAT works with VarAC. The problem is the sound card when sending. The Icom sends, but there is no NF from the sound card at the TRX. No signal is sent because the NF is missing. When receiving, the sound card works excellently. I use the same sound card settings for MixW and WSJT and it works wonderfully. Only with VarAC it doesn't work. However, the Windows sound mixer indicates that an audio signal is being generated. but it does not arrive at the radio or is not transmitted. What am I doing wrong? What needs to be configured differently? I would be very grateful for your help. 73, Olaf