The following additional return values are defined for MCI waveform-audio devices:
| Value | Meaning |
|---|---|
| MCIERR_WAVE_INPUTSINUSE | All waveform devices that can record files in the current format are in use. Wait until one of these devices is free; then, try again. |
| MCIERR_WAVE_INPUTSUNSUITABLE | No installed waveform device can record files in the current format. Use the Drivers option from the Control Panel to install a suitable waveform recording device. |
| MCIERR_WAVE_INPUTUNSPECIFIED | You can specify any compatible waveform recording device. |
| MCIERR_WAVE_OUTPUTSINUSE | All waveform devices that can play files in the current format are in use. Wait until one of these devices is free; then, try again. |
| MCIERR_WAVE_OUTPUTSUNSUITABLE | No installed waveform device can play files in the current format. Use the Drivers option from the Control Panel to install a suitable waveform device. |
| MCIERR_WAVE_OUTPUTUNSPECIFIED | You can specify any compatible waveform playback device. |
| MCIERR_WAVE_SETINPUTINUSE | The current waveform device is in use. Wait until the device is free; then, try again to set the device for recording. |
| MCIERR_WAVE_SETINPUTUNSUITABLE | The device you are using to record a waveform cannot recognize the data format. |
| MCIERR_WAVE_SETOUTPUTINUSE | The current waveform device is in use. Wait until the device is free; then, try again to set the device for playback. |
| MCIERR_WAVE_SETOUTPUTUNSUITABLE | The device you are using to playback a waveform cannot recognize the data format. |