I have noticed, that link on effects page of Nyquist plugins Audacity wiki is broken. Please, could YOu send newest version of broadcast limiter III here?
Here it is:
RFT-Limiter-III.ny (977 Bytes)
Note that this is a “soft clipping” effect rather than a true limiter.
The “Soft Clipping” option in Audacity’s Limiter effect (https://manual.audacityteam.org/man/limiter.html) is similar, but better quality. Unless you specifically want the harmonic distortion of Broadcast limiter III, I’d recommend that you use Audacity’s Limiter effect instead.