[PD] question about pd tutorial

Hi.

I'm trying to do the tutorial near the bottom of this page (the one titled "3.1.2.2.3 Processing adc-input"):

http://www.pd-tutorial.com/english/ch03.html

....which mentions "Say something into a microphone and play it back at a changed volume"

I'm not totally sure how this would work, however.

I can indeed see the signal on my mic when talking into it (i.e. it gets hotter the louder I talk) but using the slider doesn't do anything to the volume.

At least from what I can tell anyway.

Am I missing something here? Could it be my audio setup (I'm on Ubuntu 8.04 using ALSA)?

Should I be hearing the volume increase when sliding up and volume decreasing when sliding down? Because I'm not.

I'm hearing my voice in my headphones. It just doesn't change in regards to the slider's position.

Thanks for any input.

-Aaron