I used to work as a music producer way back in the morning! And back then, I was consistently looking for some state of the art and inventive ways to make audio effects, but i do recall 1 time I had this undoubtedly dumb thought. I was starting to wonder exactly what it would sound like to put a vocal through the heating and cooling duct labor for reverb effect, but yes, I know that it sounds strange, however but, I still wanted to see if the sounds of singing or speaking through the HVAC ducts of a heating and cooling plan would work. I figured because of the hollow space of the HVAC ducts through the HVAC duct, it may make some sort of an original sound. I thought I would go ahead and try this one morning with our own voice just speaking through the microphone, but then, I fed the audio through the duct labor rather than the speakers in the studio. The sound was actually very flat sounding for some reason! Singing through the heating and ac duct labor was not going to be something to check out! While I was up there in the duct labor removing all the device from our test, I observed it was nasty in there. This actually made myself and others tell the studio owner to call her local heating and cooling dealer to get the duct labor cleaned. I did suppose a little bit about Heating and Air Conditioning systems and how they worked. If that duct labor seemed dirty, it could clog up the heating and a/c unit. This had the chance to change into a major expense; Especially for a recording studio! The owner of the location actually took our advice, she also provided me a discounted rate in return the next time I recorded there.