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| need bash support
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| the format cmd
| 1, arecord.sh 2(µ¥Î»S)
| 2, ChangeVolume.sh 2mic_loopback 3(ÉùµÀÊý)
| 3, LoopbackTest.sh 2mic_loopback 3
| 4, LoopbackTest1.sh 2mic_loopback 3
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| 5 amic-loopback-no-vad.sh 16000(record rate) S16_LE(record format) hw:0,0(playback hardward)
| # 7(total times) /tmp/playback-sine-1khz-48k-16bit-2ch.wav(playback file)
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