mobile

MI3 mic volume slow than others device,how can i improve it?
First of all my english not good...
mi3 when i voice wechat,the volume slow than others,i tested before,
im sure my mic no problem,because i download another voice recorder to test it,there is no problem,
so my question is how can i improve mi3 mic volume?
my device has rooted,i hope that can improve from edit system file,or any apps to edit the system improve the mic volume..

my friend always said that my voice so slow...of course the another device is no problem...