alsa control plugin...

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Hi all,
In my hardware there is processor which will act as mixer so i wrote plug in for ALSA to make processor as mixer for ALSA.
The plugin is  in C++ and generated shared library and copied into /usr/lib/alsa-lib/.
My plugin name is Myplug.
when i use 
amixer -D Myplug set PCM 3dB+
it is giving error like 
            ALSA lib control.c:867:(snd_ctl_open_conf) Cannot open shared library /usr/lib/alsa-lib/libasound_module_ctl_Myplugin.so
amixer: Mixer attach Myplugin error: No such file or directory..

I have doubt tat Weather plug in should be C i mean shared library should be generated by c file.
if not how create a shred library by using C++ code for alsa plugin.



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