Sets the device to use for subsequent calls in the current thread.

    DWORD device


deviceThe device to use.

Return value

If successful, then TRUE is returned, else FALSE is returned. Use BASS_ASIO_ErrorGetCode to get the error code.

Error codes

BASS_ERROR_DEVICEThe device number specified is invalid.
BASS_ERROR_INITThe device has not been initialized.


As in BASS, simultaneously using multiple devices is supported in the BASSASIO API via a context switching system - instead of there being an extra "device" parameter in the function calls, the device to be used is set prior to calling the functions. The device setting is local to the current thread, so calling functions with different devices simultaneously in multiple threads is not a problem.

The device context setting is used by any function that may result in a BASS_ERROR_INIT error (except this function), which is the majority of them. When one of those functions is called, it will check the current thread's device setting, and if no device is selected (or the selected device is not initialized), BASSASIO will automatically select the lowest device that is initialized. This means that when using a single device, there is no need to use this function - BASSASIO will automatically use the device that is initialized. Even if you free the device, and initialize another, BASSASIO will automatically switch to the one that is initialized.


Get the sample rate of device 2.
BASS_ASIO_SetDevice(2); // select device 2
rate = BASS_ASIO_GetRate(); // get the sample rate

See also