This is a junk BEHRINGER XENYX 1002 FX. The reason for it being junk is, firstly, a buzzing noise. Also, I am not familiar with analog mixers at all, so I haven't been able to try out detailed settings. Operation Check Regarding the operation check, I have confirmed that sound can be produced. However, as mentioned above, when both channels 1 and 2 have their GAIN and LEVEL set to MAX, and the MAIN volume is also set to MAX, a considerable amount of noise is produced. Of course, you wouldn't normally use it like that, but the noise is present even when the volume is turned down. If you can repair it or are knowledgeable, please consider purchasing it at this opportunity. m(_ _)m *Please note that the power adapter is not included.