These are usually plug-in devices like audio synthesizers, but might also be built into your computer.  Websites are normally not allowed to access MIDI devices. Improper usage could cause damage or compromise security.
Te su zwětšego tykacowe rědy ako awdiosynthesizery, ale mógu teke we wašom licadle zatwarjone byś.  Websedła w normalnem paźe pśistup k MIDI-rědam njama. Wopacne wužywanje mógło škódu zawinowaś abo wěstotu pómjeńšyś.