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.
Hauek oro har entxufatzen diren gailuak dira, adib. audio sintetizadoreak, baina zure ordenagailuaren parte ere izan litezke.  Webguneak orokorrean ez dute MIDI gailuetara sarbidea izateko baimenik. Erabilpen okerrak kalteak eragin litzake edo segurtasuna arriskuan jarri.