Topic: macOS DriverKit driver 4.20 (and up) now available
USB series DriverKit driver V 4.20 tries to help users who suffer from clicks and dropouts with our flagship interfaces Fireface UFX III and MADIface XT II, in multiple ways:
- Various small optimizations
We have worked hard and changed/improved many smaller details in the way the driver works, to make it even more compatible and robust.
- New option Safety Offset Large in Settings dialog
As explained in the included help of the Settings dialog (see below) in some setups a larger Safety Offset is required for click and dropout free operation. The new setting Large adds a 72 samples buffer.
- Detailed error counter in Settings dialog. These 5 new diagnostic counters add to the existing CRC32 one, and show errors in USB transfers, USB data, audio restarts caused by USB transfers, audio HAL, and when data is delayed. More details are explained in the accompanying help – yes, there is a help for the Settings dialog, as usual accessed from the Mac’s top menu.
- Supports Apple's Class Compliant audio driver with UFX III and MADIface XT II (new firmware required, see links below).
Using Class Compliant mode is the last resort to click and dropout issues. For several reasons the OS included CC audio driver might show less issues than a DriverKit driver – because it is a Kernel Extension one (but does not require one to reduce security), runs with bigger safety offsets, is part of the OS and so on.
Apart from some users even reporting issues in CC mode (that we obviously can not solve from our side) CC mode is the best bet for help – but until now also was more or less useless. Because TotalMix FX was not available, the Settings dialog with all the important device settings was not available, and even changing settings at the unit was blocked when USB was connected (stand-alone mode partly inactive).
! This changes with driver 4.20 !
Installing driver 4.20 and connecting the UFX III or MADIface XT II set to Class Compliant mode Settings dialog and TotalMix FX stay fully functional to configure the device. But audio now uses Apple’s Class compliant driver. The Settings dialog then no longer shows the driver version but Apple CC to clearly indicate the active mode.
Note that in CC mode latency is a bit higher, the error counters are not available, and DigiCheck NG has no access to playback data.
Also note that with the new UFX III firmware stand-alone mode features now stay available even with USB connected. Only when TotalMix FX communication is detected the settings at the unit are locked and the ARC USB acts according to current TotalMix settings.
Downloads macOS
Note: Driver linked is now 4.26
DriverKit driver: https://www.rme-audio.de/downloads/driv … ac_426.zip
Firmware update: https://www.rme-audio.de/downloads/fut_madiface_mac.zip
Matthias Carstens
RME