R.V.

If one were to turn up the volume of music and then turn it down again very quickly (say with infinite speed), will the part where he turns it up even exist? Would the change in volume even exist? So does 2*infinity = 0? I initially posted this on 4chan's science board but never got any good answers or ideas how to solve this problem. https://boards.4channel.org/sci/thread/14349334#p14349347