You may micspam anything as a Hobo class as long as it isn't listed as not allowed. You also may micspam as any other job if the audio played is related to the jobs/models RP. If the audio played is deemed not to be RP related and you are just looking for a way to micspam something stupid as a non hobo then you will be asked to stop. (Good examples: Playing the jaws theme as a shark, pig noises as a pig, or combine chatter as a combine soldier) (Bad example: Micspamming loud music as the job "Ear doctor" to check if everyones ears work properly)
This rule seems pretty fair tbh ^