Hi,
Whenever I render out a video project with audio (wav or mp3), and no matter which template I use (I also make sure the audio tab in render is good), I notice that all my audio is lower than the original in my timeline.
Yes, I make sure the sample rate is high and Bit rate is high too...but no difference (high or low). I tried Magix AVC, HEVC and a bunch of others....(rendering to mp4)
If I only render out the audio (no video) Wave or mp3, the rendered file is the same volume as what is in my timeline.
I've had this problem for years....it's just bother me more now because I'm older :)