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The hardware can have died, then it wont appear in the list of devices. A discharge of static electricity through the device is usually what kills them.

Mine is in ‘Automatic (Optimal)’ mode and the output is always in 32-bit and integer no matter the program. I have the Evo if that’s the reason it works differently on my end?

Well, strictly speaking it’s called ‘Standard Float Mode’.

On a whim I tried turning on Integer Mode in BitPerfect with the ‘Use maximum buffer’ disabled, and this works! Sound quality is now on par with Audirvana in Integer Mode. The difference between Integer Mode and mixer mode is quite distinctive.

Thanks, that fixed it.

I’m using BitPerfect and getting a very fast stuttering that is rising in amplitude from approx. 15 mins. of playback. I eventually have to close BitPerfect and open it again to fix this issue. I have reported this to the developer, but do anyone else experience this issue? The beta 1.2 driver did *not* exhibit this issue I might add.

I’m asking because BitPerfect report that 16/44.1 program is played at 24/44.1: Now that is what is being *reported*. It might be that your driver is zero-padding the 16 bit program to fill the empty bits up to 24, and hence in practical terms still bit perfect. So is that what your are saying? For me I would prefer my program to be sent to the Hiface (and DAC) in its native bit-depth and sample rate, so for 16/44.1 program that would mean my DAC should get 16/44.1 data. Is my thinking wrong here?

Okay, so the 1.2 driver is now installed. BitPerfect is now reporting that *all* track is played at 24 bit – regardless of their actual bit-depth. A bit of further investigation gives me the following device capabilities: ---------------------- Name: HiFace UID:HiFaceAudioEngine:0 Model UID: HiFaceAudioDevice:HiFace Device Id: 78 Hogged: YES Frame Buffer Sizes: 14 - 12288 Current Frame Buffer Size: 8192 Left Channel: 1 Right Channel: 2 Sample Rates: 44.1 48.0 88.2 96.0 176.4 192.0 Audio Streams: Stream ID: 79 Stream Number: 0 Starting Channel: 1 Total Channels: 2 Total Physical Formats: 12 Physical Format 1: Sample Rate: 192000 Bit Depth: 24 Format Flags: [ kAudioFormatFlagIsSignedInteger kAudioFormatFlagIsAlignedHigh ] Format ID: mcpl Channels Per Frame: 2 Bytes Per Frame: 8 Frames Per Packet: 1 Bytes Per Packet: 8 Physical Format 2: Sample Rate: 176400 Bit Depth: 24 Format Flags: [ kAudioFormatFlagIsSignedInteger kAudioFormatFlagIsAlignedHigh ] Format ID: mcpl Channels Per Frame: 2 Bytes Per Frame: 8 Frames Per Packet: 1 Bytes Per Packet: 8 Physical Format 3: Sample Rate: 96000 Bit Depth: 24 Format Flags: [ kAudioFormatFlagIsSignedInteger kAudioFormatFlagIsAlignedHigh ] Format ID: mcpl Channels Per Frame: 2 Bytes Per Frame: 8 Frames Per Packet: 1 Bytes Per Packet: 8 Physical Format 4: Sample Rate: 88200 Bit Depth: 24 Format Flags: [ kAudioFormatFlagIsSignedInteger kAudioFormatFlagIsAlignedHigh ] Format ID: mcpl Channels Per Frame: 2 Bytes Per Frame: 8 Frames Per Packet: 1 Bytes Per Packet: 8 Physical Format 5: Sample Rate: 48000 Bit Depth: 24 Format Flags: [ kAudioFormatFlagIsSignedInteger kAudioFormatFlagIsAlignedHigh ] Format ID: mcpl Channels Per Frame: 2 Bytes Per Frame: 8 Frames Per Packet: 1 Bytes Per Packet: 8 Physical Format 6: Sample Rate: 44100 Bit Depth: 24 Format Flags: [ kAudioFormatFlagIsSignedInteger kAudioFormatFlagIsAlignedHigh ] Format ID: mcpl Channels Per Frame: 2 Bytes Per Frame: 8 Frames Per Packet: 1 Bytes Per Packet: 8 Physical Format 7: Sample Rate: 192000 Bit Depth: 32 Format Flags: [ kAudioFormatFlagIsSignedInteger kAudioFormatFlagIsPacked kAudioFormatFlagIsAlignedHigh kAudioFormatFlagIsNonMixable ] Format ID: mcpl Channels Per Frame: 2 Bytes Per Frame: 8 Frames Per Packet: 1 Bytes Per Packet: 8 Physical Format 8: Sample Rate: 176400 Bit Depth: 32 Format Flags: [ kAudioFormatFlagIsSignedInteger kAudioFormatFlagIsPacked kAudioFormatFlagIsAlignedHigh kAudioFormatFlagIsNonMixable ] Format ID: mcpl Channels Per Frame: 2 Bytes Per Frame: 8 Frames Per Packet: 1 Bytes Per Packet: 8 Physical Format 9: Sample Rate: 96000 Bit Depth: 32 Format Flags: [ kAudioFormatFlagIsSignedInteger kAudioFormatFlagIsPacked kAudioFormatFlagIsAlignedHigh kAudioFormatFlagIsNonMixable ] Format ID: mcpl Channels Per Frame: 2 Bytes Per Frame: 8 Frames Per Packet: 1 Bytes Per Packet: 8 Physical Format 10: Sample Rate: 88200 Bit Depth: 32 Format Flags: [ kAudioFormatFlagIsSignedInteger kAudioFormatFlagIsPacked kAudioFormatFlagIsAlignedHigh kAudioFormatFlagIsNonMixable ] Format ID: mcpl Channels Per Frame: 2 Bytes Per Frame: 8 Frames Per Packet: 1 Bytes Per Packet: 8 Physical Format 11: Sample Rate: 48000 Bit Depth: 32 Format Flags: [ kAudioFormatFlagIsSignedInteger kAudioFormatFlagIsPacked kAudioFormatFlagIsAlignedHigh kAudioFormatFlagIsNonMixable ] Format ID: mcpl Channels Per Frame: 2 Bytes Per Frame: 8 Frames Per Packet: 1 Bytes Per Packet: 8 Physical Format 12: Sample Rate: 44100 Bit Depth: 32 Format Flags: [ kAudioFormatFlagIsSignedInteger kAudioFormatFlagIsPacked kAudioFormatFlagIsAlignedHigh kAudioFormatFlagIsNonMixable ] Format ID: mcpl Channels Per Frame: 2 Bytes Per Frame: 8 Frames Per Packet: 1 Bytes Per Packet: 8 ---------------------- As you can see there are only 24 and 32 bit modes available – what happened to the 16 bit modes???????? BitPerfect is always in exclusive mode on whatever output device is chosen, it has no other mode. Integer mode set in BitPerfect still doesn’t work, and I’d like to find out if that is an issue with your driver or not. There is with your 1.2 driver no clipping.

The problems are that 1) Integer mode as set to ‘on’ in BitPerfect does not work. Should it? Or are you saying that integer mode is always on by default if the Hiface is in exclusive mode? 2) There is clipping when playing music. Hasn’t happened before so it must be your drivers fault. How and when will this be fixed?

1) So integer mode is still not possible with the Hiface? 2) Is that why BitPerfect can’t play back in integer mode (because the Hiface does not support it?)

Now all your music is output at 32-bit, and hence no longer bit perfect. Kinda defeats the purpose of using BitPerfect in the first place.

Seems like you’ve never heard of the BitPerfect app: https://itunes.apple.com/us/app/bitperfect/id455545700?mt=12 I use it, and it takes over the playback from iTunes (like Amarra and PureMusic) and outputs the program bit perfect. There are two issues when using it: 1) Integer mode set in BitPerfect does not work. Only the occasional snippet of program is heard when integer mode is on. 2) Clipping occurs with your driver, and that didn’t happen when I was using the W4S driver hack.

Clipping when playing from iTunes & BitPerfect – how do I fix that?

While you’re at it, please also test BitPerfect. I can’t get it to play integer mode. If I set it to integer mode I only get very short snippets of program with long pauses in between.

The commands that report an error you can just ignore. They only act on things that are there (and in your case not). Give your system a minute to digest the changes you’ve made. If that doesn’t help then run sudo touch /System/Library/Extensions again. If that doesn’t help then reboot.