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我将GAIN0设置成1就可以增加两倍我在将GIAN1设置成1就无法达到64或者128.原采样值28000，两倍后56000. 128倍好70000
设置增益需要GAIN0和GAIN1同时设置才行，不是单设置GAIN0和GAIN1。
比如增益为1的话，需要GAIN0=0，GAIN1=0.
G=2,GAIN1=0， GAIN0=1
G=64，GAIN1=1，GAIN0=0
GAIN=128， GAIN1=1， GAIN0=0
