| MMSYSERR_ALLOCATED | Requested device is already allocated. |
| MMSYSERR_ERROR | Unspecified error. |
| MMSYSERR_NOERROR | No error. |
| MMSYSERR_NOMEM | Memory allocation error. |
| MMSYSERR_NOTENABLED | Driver is not enabled. |
| MMSYSERR_NOTSUPPORTED | Driver does not support specified operation. |
In addition to these general error return values, there are error return values unique to each type of audio device. The following table lists these device-specific error return values.