I'm experiencing audio troubles with my Vegas Edit Pro. If I render a short video, or only the loop region that I get trouble in full video, this noise doesn't show up, but rendering the full video I get this problem in the same video point, even if I change audio frequency and bitrate. The trouble sounds like "SHHP", and this is the wave:
I'm rendering using MAGIX HEVC/AAC MP4 HD 1080p 50 fps (NVENC)