To figure out what values you should be using for tMin and tMax it is a good idea to pick the ('Both Channels')('Slider') in the graph editor looking at only the value graph and choose the minimum and maximum values you want to use to trigger your effect. T = thisComp.layer('Audio Amplitude').effect('Both Channels')('Slider') When you are using the Keyframe Assistant to Convert Audio to Keyframes you generally define t like this and then define a valud (v) for the ease method. tMin is the minimum value that number is going to be, tMax is the maximum value for t.
If you look at the method generated by the Expression Language Menu you will see something like this: The ease() or linear() methods generate one value.
