Ok, thanks, I’m trying hard. I get to Plug-in Manager: Effect, Generators and Analysers just as it appears in the Audacity manual, underneath which it says ‘The shipped plug-ins must be enabled using this dialog.’ But I can’t understand how to use this tool. When I click the ‘all’ button as instructed, all the effects I already have are listed there, enabled, but how do I import the noise gate which doesn’t appear? The instructions don’t explain this, so far as I can see.
In Programs (x86) \Audacity\Plug-Ins\ Noisegate is there, but as a yellow book file unless I click on it, when it appears like the others, in a separate box, with a help descriptions underneath. How do I move it into the Plug-In Manager?
Look carefully through that list and find C:Program Files(x86)\Audacity\Plug-Ins\Noisegate\noisegate.ny
When you find it in the list, click on it so that it is highlighted, then click the “Enable” button, then click the OK button.
The effect should now be listed in Audacity’s Effect menu.
So, select “noisegate.ny” in the "C:Program Files(x86)\Audacity\Plug-Ins\Noisegate" folder, right-click “noisegate.ny” and choose “Cut”.
Move up into "'C:Program Files(x86)\Audacity\Plug-Ins", right-click in empty space, and choose “Paste” (or hold CTRL on your computer keyboard and press V).
Now you should see “C:Program Files(x86)\Audacity\Plug-Ins\noisegate.ny” in the Plug-in Manager. Click that row, click “Enable”, then OK. Look for Noise Gate in the lower part of Effect Menu (underneath the dividing line).
I did it! But it wasn’t there in the list - I had to figure out a way of opening the zip file and then copying it to the plug-ins downloads; then it worked. I guess it’s obvious to many folks how to do that but not to me - I wish there were slightly more detailed instructions in the handbook. But thanks for your help.
By the way, in that list there is also an item called Noise: Built-in effect, noise But although it’s in the manage list it doesn’t appear in the drop-down list of Effects. Why is that and what does it do?
According to the import error you reported, you had already extracted the NY file from the zip file, but you had done so into a separate folder called “Noisegate” instead of into the top level of Audacity’s “Plug-Ins” folder.