Scaling the signal of wave

I have a code 

[f,Fs] = wavread('wolf.wav');

sound(f, Fs);

N = length(f);

slength = N/Fs;

t = linspace(0, N/Fs, N);

   plot(t, f);

now i have to decompose the signal by using dwt ,monolevel and scale the coefficients in the range[-(2^15-1),(2^15-1)]

please help