What are the best noise reduction plugins? I suppose it doesn't have to be open source, but that would be nice.
Noise reduction is normally best achieved in dedicated stand-alone applications. You should take a look at gnome wave cleaner (or gwc for short).
Another option, depending on the type of the noise and the wanted signal is simply gating and/or eq'ing the signal. Gate to remove noise from places where there is no signal and eq to attenuate the noise throughout the signal.
Your subscriptions & donations are critical help that make it possible for full-time development of Ardour to continue. Your support is critical and much appreciated.
September goal US$4500 (US$54k/yr)
Total till now: US$825.78
Subscribers 1031 US$1578/month
Support Ardour, get free upgrades: pay $1, $4, $10 or $50/month for a year: