Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. AHI (for Audio Hardware Interface) is a retargetable audio subsystem for AmigaOS, MorphOS and AROS. It was created by Martin Blom in the mid 1990s to allow standardized operating system support for audio hardware other than just the native Amiga sound chip. AHI offered improved functionality not available through the AmigaOS audio device driver, such as, seamless audio playback from a user selected audio device (in applications which supported AHI), standardized functionality for audio recording and efficient software mixing routines for combining multiple sound channels thus overcoming the 4 channel hardware limit of the original Amiga chipset. The first official release of AHI was in 1996 . AHI became a widely supported standard for audio hardware and audio software on Amiga systems and was officially included in later operating system releases.