Just to build a bit off of Robin’s advice. When I teach my classes on mixing, I teach my students to do a couple of steps in their project near the beginning (This is primarily for use when you are dealing with imported audio from elsewhere which we are, but the basic ideas are still applicable):
- Normalize the regions to -1dB
- Turn down the trim to -10dB
- Lower their faders to -10dB
- Use Region gain (CTRL+6, and CTRL+7 in Mixbus, can’t remember the shortcuts in Ardour) to decrease any sounds that are overpowering to create a basic mix. Note to only decrease as you have already normalized the audio, and while Ardour will not have a problem with above FS in itself, there isn’t a guarantee that plugins will not have issues depending on what plugins you use.
This gives you a basic mix, with decent gain structure to work from, and room to bring things up if needed. The reason I am so conservative to start with is everyone has a natural tendency to turn things up rather than to turn everything else down. You don’t want to go overboard with it though for the same reason as not caring about gain structure, while Ardour may be fine, I can’t guarantee all plugins would be, so good gain structure is always important.