sparkfun KIT-14173 Hook-Up Manual page 18

Page 18 of 33
Extra credit- trimming the fat and making the sound louder
As you can see in my file above, there's a great deal of room between the
extents of the sound and the extents of the window. In the time (horizontal)
axis, this manifests as flat lines before and after the content of the sound
file. In the "loudness" (vertical) axis, this manifests as space between the
top and bottom of the waveform file and the top and bottom of the playback
position window.
Let's eliminate some of that dead time before and after the sound plays. To
do so, simply click inside the playback position window and drag, as though
you are trying to select a section of text. The part you've selected will be
highlighted, as above. Now, just hit the "Delete" key on your keyboard, and
that section will be removed. Repeat the process at the other end of the
sound.
Now, let's see what we can do about volume. Under the "Edit" menu, look
for the "Select" submenu, and choose "All" to select the entire sound. You
can also just use the drag-and-highlight method from above.
Now that you've got the entire sound selected, click on the "Effect" menu
and select the "Amplify..." option.