You can request:
- reduction in background hiss or hum
- top and tail the crackle from a vinyl record dubbing
- normalization to specified dB
- adding effects such as reverb, echo, phasing, etc
- file format conversion
In my gig extras I can add your choice of background music, remove breaths, umms and errs and perform detailed de-clicking of vinyl record dubbings
I would need a short sample of your audio to assess what needs to be done.