Volume Control in Risc OS 4.39

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wolfgang
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Volume Control in Risc OS 4.39

Post by wolfgang » Wed May 27, 2020 12:20 pm

I managed to install !KinoAmp on my RiscPC and can play back mpeg videos now, but I can't figure out how to adjust the volume from within the OS. Isn't there something like a sound/audio mixer built-in?

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helpful
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Re: Volume Control in Risc OS 4.39

Post by helpful » Wed May 27, 2020 10:59 pm

There are the sound settings within the configuration (double click on the !Boot application), although how much control it gives rather depends on your RISC OS version.
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wolfgang
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Re: Volume Control in Risc OS 4.39

Post by wolfgang » Fri May 29, 2020 11:27 am

Yes, it looks like this, but the slider has no effect on the volume of mp3 or mpeg files
fig74.gif
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Re: Volume Control in Risc OS 4.39

Post by philpem » Fri May 29, 2020 11:48 am

Does it affect the sound of the system beep?

Could be the MP3 player has its own volume control and is overriding the system one.

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Re: Volume Control in Risc OS 4.39

Post by sirbod » Fri May 29, 2020 10:30 pm

If KinoAmp doesn't have an inbuilt volume control, your options are somewhat limited. KinoAmp will more than likely be using 16bit sound, either as a linear driver or via SharedSound, neither or which are affected by the volume control to my knowledge.

All the volume control does is set an OS variable, it's up to software if it wants to alter sound volume by adjusting the samples accordingly when they fill the sound buffer.

If KinoAmp is using SharedSound, I think there's an SWI to control driver volume, but you'll need to both find the documentation for it and figure out which driver KinoAmp is registered as before you can see if it does adjust the volume.

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