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command line - How to get sound intensity of an audio input through terminal? - Unix & Linux Stack Exchange
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Figure 2 from Audio Arduino - an ALSA (Advanced Linux Sound Architecture) Audio Driver for FTDI-based Arduinos | Semantic Scholar
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How To Install Sound Switcher Indicator 1.2.2 On Ubuntu 14.04, Ubuntu 13.10, Ubuntu 12.04 And Derivative Systems Using GTK Based Desktop Environments | LinuxG.net
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PDF) Audio Arduino - an ALSA (Advanced Linux Sound Architecture) audio driver for FTDI-based Arduinos
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