What I expected to happen was...:
The dispenser to make a noise When its shot out an item
What actually happened was...:
It did not make a noise and was silent
Steps to Reproduce:
1. I Made a dispenser clock
2. Put items in
3. and it shot them out but it was silent
Was unable to reproduce with the arrangement given in the screenshot; the lower dispenser fires items and produces the expected sound. Is the "Blocks" slider in Options > Music & Sounds turned off by any chance?