Well as the kernel src code used by ardatdat is the I9103XWLA4 kernel src code, he may need some time to get the code ported from I9103ZCLA1 to I9103XWLA4 as the I9103XWLA4 does not have the code supporting 2 way call recording.
This is because the I9103XWLA4 and I9103ZCLA1 are built by 2 different groups of dev, one by the one in EU, and the other one is by the one in China.
btw I cannot sure that voodoo sound patch works with CONFIG_MACH_N1_CHN as CONFIG_MACH_N1_CHN is patching the code for WM8994 codec as well, which is the one that modified by voodoo sound.