It is possible that you have done several language courses. However, nothing prepares you to work day-to-day as a sound engineer, if you are on tour in a country where a language other than your native language is spoken. It is likely that no matter how many courses you do, you have not been taught how to “comb the wires” (slang for ¨Untangle the wires¨ in Spanish), and many words of technical, and even everyday jargon.