I use both. Pangolin for anything that absolutely requires an external connection, netbird for internal.

If you can, you should add verb form/conjugation practice and/or something to help learn the functions of all the particles. I’m too committed to using anki for my vocab to switch to another tool at this point but I would love to find FOSS software that helps me with my grammer.

The process you’re looking for is called loudness normalization. You want to batch normalize your audio files to a set LUFS value(probably around - 14LUFS). I think there is a way to do this in batch proccessing with audacity.