No Audio From Sample Editor In Logic, How can I hear audio from this location? Options

[kilowatt]

Ok, I'm a pretty new Logic user (Logic Platinum 5.4 on Mac OS X 10.3.2 with an M-Audio Delta 1010).

When I want to edit a waveform, say, reverse part of it, and maybe do some old fashion copy and paste on it, I double click it from the Arrange window, and it brings up the Sample Editor.

When I press the button that looks like a speaker (and pressed, its a green speaker), the audio should play, correct? The cursor moves, but there is no sound. Viewing the M-Audio control panel mixer application shows no audio on any channels. Scrubbing audio is also mute.

Now, it has worked in the past, but it seems as though I must be setting something wrong. I'm very new to this, so excuse me if this is a dumb question ;-)

Thanks in advance!

--Elliott