[y,Fs] = audioread('myAudioData.wav');
Fs will be the sampling frequency (number of samples per second) and y the sampled data. If you are interested in the audio data in the interval [10,15] seconds, then you could extract that data as
cutData = y((Fs * (10 - 1)) + 1 : Fs * (15 - 1), :);
and plot it as
plot(linspace(10, 15, length(cutData)), cutData);
The above might do what you want...or at least give you an idea of what can be done.
