Need help: control master volume

[Mirko Boehm]

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Hi everybody, 

I need help with the following issue: 

Usually, notebooks ship with volume control buttons. Some models rely on 
software to actually change the module, for example some Sony models. Now in 
kdeutils/kmilo/kmilo_kvaio/kvaio.cpp, you will find the following method: 

bool KVaio::modifyVolume(int /* step */)
{
    // we increase the volume if step is gt zero, and decrease it if
    // step is lt zero:
    if(mClient.isAttached())
    {
	// add a DCOP call here
    }
    return false;
}

I tried a couple of ways to implement it, but nothing seems to work relyably. 
For example, my prefered method (calling kmix via dcop) depends on kmix 
actually running. 

Another issue is that I did not find information if the volume integer values 
are standardized or depend on hardware. Therefore a method which takes a 
percentage or a normalized float between 0.00 and 1.00 as an argument would 
be much appreciated. 

Can anybody, especially the multimedia developers help me with this?

Best regards,

- --Mirko.
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