This post was in response to a now banned user who was posting questions copied from other users
There is no 2.11 or 2.12 version. The current 2.1.2 version is available here: http://www.audacityteam.org/download/.
Thanks for the report about the graphic sliders, but this has now been fixed in our source code so it will be fixed in the next 2.1.3 version when released.
The maximum frequency displayed in Equalization is half the sample rate of the track, because a given sample rate can only contain frequencies up to half the sample rate.
Equalization does not preview or apply correctly if the project contains tracks at different sample rates.