Multi wav channel with separate volume control.

[Ing.Marinangeli]

Hi everybody,
I have a multi channel wav file ( 4 mono channel ) and need to separate 
each channel, change the volume for each channel and send all to alsa 
sink device.

At the first, I tried to realize a gst-launch command line to build that 
pipeline but without any good result.

At the moment I am able only to select one channel to play with this 
command line:
gst-launch filesrc location="/media/sdb1/ALL_night_Long.wav" ! wavparse 
! deinterleave name=d d.src3 ! adder name=add !  alsasink


May be, the right way to realize my goal,
is to use deinterleave element to split the original stream to single 
channel audio stream.
Use 4 volume element to control the level for each single audio stream 
and use an adder element to mix all stream before to send them to alsasink.
Is this correct?

Someone could suggest me a example pipeline?

I can't understand how I can connect single deinterleave source pad ( 
d.src3 in my example) to Adder sink pad ( add.sink0 for example).

Thanks,
Giorgio.