The FFT filter cannot be used with a screen reader - the user needs to
a curved line representing different frequencies and what level those
frequencies are. You might instead want to use a plug-in which works well
with a screen reader, you can get a zip file of it from
It's got fifteen frequency bands, equally spaced, and each band you can
cause to amplify (value above zero db), or attenuate (drop, numbers below
zero db). A db reading of plus or minus 6 db is the same as twice or
one-half the volume for that particular band.
Once you've unzipped the file into your Audacity plug-ins folder, the
effect will appear as "Custom 15 band E Q" under the effects menu.
As for SC4, I'm not sure, but I did notice at the top of the screen when
I click on SC4 that there's an email address of the SC4 author, perhaps he
has documentation (which I didn't find on the Audacity site).
On Thu, 21 Sep 2006, Anders Holmberg wrote:
> Can someon on the list describe two effects in audacity that i really dont understand.
> THe sc4 effect and the fft filter.
> I have tried to apply them but it does not seem to be any changes.
> I would be very thankful for any help.