what george says has got to be it
if the dac has a volume adjust function it can be turned off/on as sometimes people just use it as a straight dac into a preamp
if it didn't come with a manual you should see if it can be downloaded from their website
if the dac has a volume adjust function it can be turned off/on as sometimes people just use it as a straight dac into a preamp
if it didn't come with a manual you should see if it can be downloaded from their website