How to add an audio mixer[SOLVED]

[Badriel]

Hello, I'd like to add an additional audio mixer to a VN, with separate volume bar.
I want to have "ambient" channel, with a volume bar.
So far I've figured I need something like this:

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init python:
    renpy.music.register_channel("ambient", "sfx", True)

But I don't want to use "sfx" mixer, but a custom one. How can I achieve this?

[PyTom]

Just use your own mixer, rather than sfx. You'll also want to update the preferences screen to add a bar with a MixerValue that updates the mixer you create.

[Badriel]

Just use your own mixer, rather than sfx. You'll also want to update the preferences screen to add a bar with a MixerValue that updates the mixer you create.

Yeah, that's what I wanted to do from the beginning, but I didn't know how.
But finally I realized how to do it. I added lines:

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elif name == "ambient volume":

            if value is None:
                return MixerValue('ambient')
            else:
                return SetMixer('ambient', value)

into 00screen.rpy
and

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renpy.music.alias_channel(1, "ambient")

into 00mixers.rpy