Start your audio program, or download and install the free audio editor Audacity if you do not already have a program.
Select the "Effect" menu or similar function on your audio program and then select "Change Pitch..." Use the slider to select the change in pitch by percentage. Press "OK."
Select the "Effect" menu again. This time, select "Change Tempo..." or the equivalent function in your audio program. Again, use the slider to determine the percentage increase you would like to make. A positive value increases the tempo while a negative value will decrease the value. Press "OK."