Hi, I use UDOO to develop VOIP products. UDOO is equipped with VT1613 as the audio codec. We need a special function. The sound captured from Mic In should be routed to Line Out. I checked the datasheet and find that register 0Eh seems to control the function. I use UdooBuntu Linux OS. I use alsamixer utility to modify codec settings. I found "MIC Recording" option seems to correspond to register 0Eh. As I modified"MIC Recording" option by alsamixer utility, the function did not work. What did I miss? How should I do with VT1613 register settings to implement my special function? Thanks in advance.