how to record and analyze audio in real-time from two channel (stereo)?

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hoda kazemzadeh 2018-5-9

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https://ww2.mathworks.cn/matlabcentral/answers/399868-how-to-record-and-analyze-audio-in-real-time-from-two-channel-stereo

I tried the code form "Geoff Hayes" in the page with the following title :"plotting the recorded sound while recording". It is working for one channel but for stereo audio processing when I change the number of the channel from 1 to 2 , I see nothing in the figures. How I should manage the functions to well detect the different samples from 2 channels (without mixing). for example I have to repeat two time this function: recorder = audiorecorder(Fs,24,1)? recorder1 = audiorecorder(Fs,24,1); recorder2 = audiorecorder(Fs,24,2); like this? and the same for the other functions?