No effects?

Just downloaded audacity, trying to separate vocals from tracks but I cannot invert it once I separate the two tracks due to effects not being useable…

If you are on Mac OS X, please check that you have installed Audacity correctly (see here:

For any other platform, please ensure that playback is Stopped (click the “Stop” button). Most functions are disabled during Play, Record and Pause.

If you have further question, please note the text in the pink box above. We are able to help more effectively if we know what sort of computer you are using.