Audacity Forum

steve wrote: The middle slider was named "Wet Level" and it controlled the output level of the clipped signal.
The third slider was named "Residual Level" and it controlled the output level of the unprocessed "dry" signal.
In other words, the second and third sliders controlled the Wet/Dry mix, but in a rather confusing way that few users understood (including yourself it would seem).

This can't be.... I always (really always) set "Residual level" to zero, so the wet one should be the only output. But, if I also set the wet level to zero, the output should be nothing. But the output was hard clipping. If I set the wet level to the highmost value, nothing was been changed. Any values between made a softer clipping.

I lived with that magic and I never questioned it. It worked for years

Now, I search for the old hard limiter and found this:
Look here: http://ttmanual.audacityteam.org/man/Hard_Limiter

So it was NOT a wet/dry mixer . (but now I know, what the third slider did )