I have the same hardware and the same problem with ubuntu and debian. 
Mine is a Green iMac G3 400MHz DV firewire .

I'm running 2.6.18-4-powerpc with   alsa-base  1.0.13-5  on debian 4.0 
currently,
but experienced the same issue with ubuntu 6.06

My amixer output in case it's still of use follows:
The mixer channel labelled "PC Speaker" is the one that actually controls the 
volume,
which is suspicious when you think about the sound quality.
NiallB

> [EMAIL PROTECTED]:~$ amixer 
> Simple mixer control 'Master',0
>   Capabilities: pvolume pswitch pswitch-joined cswitch cswitch-joined
>   Playback channels: Front Left - Front Right
>   Capture channels: Mono
>   Limits: Playback 0 - 15
>   Mono: Capture [off]
>   Front Left: Playback 11 [73%] [on]
>   Front Right: Playback 11 [73%] [on]
> Simple mixer control 'Headphone Detection',0
>   Capabilities: pswitch pswitch-joined
>   Playback channels: Mono
>   Mono: Playback [off]
> Simple mixer control 'Line',0
>   Capabilities: cswitch cswitch-joined
>   Capture channels: Mono
>   Mono: Capture [off]
> Simple mixer control 'CD',0
>   Capabilities: cswitch cswitch-joined
>   Capture channels: Mono
>   Mono: Capture [off]
> Simple mixer control 'Mic',0
>   Capabilities: cswitch cswitch-joined
>   Capture channels: Mono
>   Mono: Capture [on]
> Simple mixer control 'Mic Boost',0
>   Capabilities: volume volume-joined
>   Playback channels: Mono
>   Capture channels: Mono
>   Limits: 0 - 2
>   Mono: 2 [100%]
> Simple mixer control 'PC Speaker',0
>   Capabilities: pvolume pswitch pswitch-joined
>   Playback channels: Front Left - Front Right
>   Limits: Playback 0 - 15
>   Mono:
>   Front Left: Playback 11 [73%] [on]
>   Front Right: Playback 11 [73%] [on]
> Simple mixer control 'Capture',0
>   Capabilities: cvolume
>   Capture channels: Front Left - Front Right
>   Limits: Capture 0 - 15
>   Front Left: Capture 14 [93%]
>   Front Right: Capture 14 [93%]
> Simple mixer control 'Auto Mute',0
>   Capabilities: pswitch pswitch-joined
>   Playback channels: Mono
>   Mono: Playback [on]
> Simple mixer control 'Beep',0
>   Capabilities: pvolume pvolume-joined
>   Playback channels: Mono
>   Limits: Playback 0 - 100
>   Mono: Playback 17 [17%]

-- 
old green Imac g3 gives bad sound.
https://bugs.launchpad.net/bugs/57075
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