ds-7216huhi-k2

Hi genius. Please, I need help with Hikvision Dvr. So I have this 16channel dvr with 16 cameras. And have two microphone in line 1 & 2. Is their anyway can I listen what’s on channel 10 camera? Because, dvr have only 4 channel audio input. And I can only hear ch1 and ch2. Thanks in advance.