Hello, I found the defines for the Falcon XBIOS errors in the MiNTLib. #define ESNDLOCKED __KERNEL_NEG(129) /* Sound system is already locked. */ #define ESNDNOTLOCK __KERNEL_NEG(130) /* Sound system is not locked. */ But my Falcon Developer Documentation describes the errorcodes with SNDLOCKED -129 SNDNOTLOCK -128 Why have FreeMiNT other values or is this an error from the docu? Gerhard