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Yes, it is possible to split audio channels in ALSA or arecord using programming. One way to do this is to read the audio stream from a device or file and then separate the audio channels into different buffers. This can be done using the ALSA library in C or C++, or with third-party libraries such as PortAudio or Libsndfile. Additionally, some audio programming environments such as PureData, Max/MSP, or SuperCollider provide built-in tools for splitting and manipulating audio channels.