Quick audio cleanup filters in Kdenlive I have a project where people are talking in amateur footage. That means no lava or overhead microphone. Just digital camera. A lot of outside noise is caught.

Is there a filter, multi-band equalizer, compressor, limiter or anything I can drop on all the little fragments of audio to make the end result somewhat better? There are tools that might be able to do the job, but all tools come without any presets, so it's hard to figure out sensible defaults without a more technical background in audio. Furthermore, settings that depend on current levels (i.e. "attack") seem to be reset on every audio snippet and I don't believe I can let all the audio be treated as one channel.

Once the project is complete, a more dedicated audio software can be used. But it will take a while and a lot of exports will be made. I have no time to finalize the audio externally for every export. It would be nice if there was a way to improve the audio somewhat using clever computer wizardry.

Perhaps there is a trick, like freezing all the audio into one single clip and apply some presets on that.
Currently your best bet is to extract the audio of the clip before you start editing, and then importing it into Audacity, which has a great toolbox for dealing with outside noise.
Once done, you can export from Audacity and back into Kdenlive.
It's a workaround, and very labor intensive. It would have been much nicer to be able to apply some basic audio filters directly in Kdenlive.