Cannot set audio level to zero

Hi,
I know how to edit the audio levels and have no trouble setting it, from 0% to 150%.
With the video clips this works fine. I can go from complete silence to full volume.
When I try this with an audio only track, I can set the fader from 0% to 150%. The audio gets louder as I increase the percentage. When I set the percentage to zero however, I can still hear the audio. It's softer, but still there.
I've tried using the "fade" feature, dragging the line from starting level down to zero. The audio fades, but not to complete silence. I'd say the level is equivalent to the 10-15% level I get when fading video.
I have iMovie version 5.0.2.
Any and all suggestions appreciated!
iMac G5 2.1Ghz 20" Flat Panel Mac OS X (10.4.3) BondiMac G3, 233MHz, OS 9.2.2, iMac G4 Flat Panel, 800MHz, OS 10.2.8

Hi,
The audio clip contains only music. The video clip contains only spoken word. It was a good idea though!
Thanks for posting!
ap

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# Use PulseAudio by default
#pcm.!default {
# type pulse
# fallback "sysdefault"
# hint {
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# description "Default ALSA Output (currently PulseAudio Sound Server)"
#ctl.!default {
# type pulse
# fallback "sysdefault"
pcm.!default {
type plug
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@func getenv
vars [ ALSAPCM ]
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Last edited by Score_Under (2013-08-02 23:23:27)

Situation update:
1. I didn't need my asound.conf like that -- I should have used pulseaudio in the first place, I was unaware that ALSA does not allow more than one program to use the sound device at the same time, whereas pulseaudio is used to mix sounds.
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Last edited by Score_Under (2013-08-02 23:22:45)

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