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peppyalsa is the ALSA plugin which sends a current audio volume level to a named pipe. Any application written in any language can read that data from the other end of the named pipe and use it for its own purposes. The most common usage is displaying volume level either in GUI or in some hardware device.

Another functionality provided by peppyalsa is a Spectrum Analyzer. The plugin sends amplitude signal for each frequency band to a specified named pipe. Any application can read that data from the other end of the named pipe and either display it in GUI or in some hardware device.