How to set a volume property in audiomixer's sink pads?

[Natanael Mojica]

Hi:

I have a audiomixer element in my pipeline, and others elements linked into
that
but now I want to change de volume of any audiosource connected to a
audiomixer

        gst_bin_add(GST_BIN(pipeline), source->get_bin());
        GstPad *mixer_pad = gst_element_request_pad (audiomixer,
mix_template, NULL, NULL);
        GstPad *a_pad = gst_element_get_static_pad(source->get_bin(),
"audiosrc");
        if (gst_pad_link (a_pad, mixer_pad) != GST_PAD_LINK_OK ){
                 g_critical ("link audio source to audiomixer failed.\n");
                 exit(1);
         }

for example

filesrc -> decodbin -> queue -> audiomixer (sink0)

filesrc2 .....                               -> audiomixer(sink1)
....
....
...                                               -> audiomixer (sinkn)
My question is , how to set mute all sink less sink2 o sink3 , or set a
volume property in 4 of the sink2 pad

thanks
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