Announce: Enhanced Digital Output app - USB Dac and 192k Digital Ouput

[JohnSwenson]

Hi Triode, I finally got around to trying this, it works fine with all my USB DACs. Currently I don't have a DAC with 192 S/PDIF input so I can't test that.

The only issue I have is that it's kind of painful to switch between USB DACs. Once you gedt it working with say DAC A, you unplug power, plug in DAC B then plug power back in, but now you get an indefinite spinny saying DAC unconnected. You have to unplug power, plug in DAC A, plug in power, bring up settings, switch to an internal mode, unplug power, swap DACs, plug in power, go to settings, select new DAC. It's certainly doable but it takes a LOT of reboots! It would be really nice if the Unconnected DAC just went to the settings page and let you choose one of the current devices.

Other than that, great job!

John S.

[Triode]

How do I check for underrun messages?
Do they get echoed to the SBT console?

You need to ssh into the touch and type dmseg - don't worry if you don't know what ssh is.

[Triode]

The only issue I have is that it's kind of painful to switch between USB DACs. Once you gedt it working with say DAC A, you unplug power, plug in DAC B then plug power back in, but now you get an indefinite spinny saying DAC unconnected. You have to unplug power, plug in DAC A, plug in power, bring up settings, switch to an internal mode, unplug power, swap DACs, plug in power, go to settings, select new DAC. It's certainly doable but it takes a LOT of reboots! It would be really nice if the Unconnected DAC just went to the settings page and let you choose one of the current devices.

When you get the spinny you can cancel it by touching the screen... The idea at present is as soon as you power up the previously selected dac that the box will reboot and use it. It needs to reboot as the jive binary only selects an output device at startup.

Anyway I was thinking of changing it slightly to provide better support for powering on and off the dac while touch is running (as used by one of the beta testers). I was assuming people would tend to have one dac, but would possibly want to power it on and off. So my plan was to remove the spinny and treat a non existent dac as actually present. This will mean more changes to jive_alsa which I think are viable but I've not tried yet. The limitation I have is being able to make changes to the jive_alsa binary but not jive itself.

Longer term if Logitech become interested then we can think about changes to the jive binary to allow swapping output devices while running. But that's not an option at present if we want full feature support.

[HumanMedia]

I noticed that there is a Remove option for the app in the app menu. Does this completely remove all files and restore the stock kernel?

[Triode]

I noticed that there is a Remove option for the app in the app menu. Does this completely remove all files and restore the stock kernel?

No - do this and then a stock firmware update to remove the custom kernel - this will get you back to a standard installation.

[HumanMedia]

You need to ssh into the touch and type dmseg - don't worry if you don't know what ssh is.

Will do. Note that after a reboot there is a message on the final line, don't know if it is related to the app or not

CMD_RESP: cmd 0x801f error, result=0x1

But when the playback starts dropping out again I will check then.

Note that I think it may occur at a random period after I have selected a 176khz file (which my version of my DAC is known to have troubles with and doesn't play) and then Ive selected a 192 kHz files at sometime after that.

I will try and get a repeatable pattern.

[Jacky]

Will the custom kernel be "overwritten" by the additional installation of TT3 and set off 192khz option or only some priorities replaced?

Anybody already tried?

[WKB]

Will this work with the USB on the Young DAC ?

[Covenant]

Is it my imagination or does the audio quality sound better with this app, even on even lower sampling rates (44.1, 48, 88.2, 96) than the stock SBT?
Could this be the case?

That's what I found but I wanted someone to confirm it before I posted. I installed it over TT3.0 without any problems. The combination sounds brilliant to me.

[Rbbert]

I'm having some trouble. My firmware is 7.7.2; the app appeared to install correctly following all the steps outlined. Under audio settings it is now "digital output only". Under "My Apps" it says there is nothing installed, but in App Gallery it says it is installed. I go coax out to an external DAC which supports 24/192, but when I try to play my 24/192 WAV files the DAC says 44.1 and the file plays back like a 192 file using a 44.1 sampling rate (i.e. very very slow).

[Jacky]

That's what I found but I wanted someone to confirm it before I posted. I installed it over TT3.0 without any problems. The combination sounds brilliant to me.

Me too; just installed over TT3; Buffer will set back to 20.000, else no otherwise sound deterioration, even a low improvement to TT3 , but needs
further comparisons.

[terjehaa]

I'm having some trouble. My firmware is 7.7.2; .........
I go coax out to an external DAC which supports 24/192, but when I try to play my 24/192 WAV files the DAC says 44.1 and the file plays back like a 192 file using a 44.1 sampling rate (i.e. very very slow).

+1
Exact same issue here.

[Triode]

I'm having some trouble. My firmware is 7.7.2; the app appeared to install correctly following all the steps outlined. Under audio settings it is now "digital output only". Under "My Apps" it says there is nothing installed, but in App Gallery it says it is installed. I go coax out to an external DAC which supports 24/192, but when I try to play my 24/192 WAV files the DAC says 44.1 and the file plays back like a 192 file using a 44.1 sampling rate (i.e. very very slow).

Wav files won't work at present above 96k as the LMS server and logitech firmware does not support it. Suggest you try flac files or disabling native playback of wav in the filetypes menu. [This should be fixed in 7.8]

[Triode]

Will this work with the USB on the Young DAC ?

Don't know - does the Young dac support standard USB audio class 1 or 2 drivers (so works with the native drivers in osx or linux)?

[SBGK]

Congratulations Congratulations Congratulations

Stunning sound quality out of the box, didn't realise it affected all resolutions until I saw HumanMedia's post

Have added in TT3.0 and my own tweaks and sound is unbelievable. Haven't tried 192 yet, but just 44.1 and 96 sounds superb. Surprised Logitech allowed you to release it, it must blow the competition out of the water.

am using the advanced kernel don't switch to low power setting, I know from the core parking disabling feature in Windows what an effect this has to the sound.

priorities below

/$ ps -eo pid,tid,class,pri,rtprio,cmd | sort -nrk 4
Unknown HZ value! (86) Assume 100.
3 3 FF 139 99 [posixcputmr/0]
49 49 FF 138 98 [IRQ-34]
9 9 FF 137 97 [sirq-tasklet/0]
11 11 FF 136 96 [sirq-hrtimer/0]
410 410 FF 135 95 [loadavg]
764 764 FF 134 94 jive_alsa -d hw:CARD=TXRX -c default -b 92790 -p 4 -s 24 -f 1
407 407 FF 133 93 [IRQ-25]
5 5 FF 132 92 [sirq-timer/0]
7 7 FF 131 91 [sirq-net-rx/0]
6 6 FF 131 91 [sirq-net-tx/0]
416 416 FF 130 90 [IRQ-45]
356 356 FF 130 90 [IRQ-7]
264 264 FF 130 90 [IRQ-33]
258 258 FF 130 90 [IRQ-57]
125 125 FF 130 90 [IRQ-42]
12 12 FF 129 89 [sirq-rcu/0]
10 10 FF 129 89 [sirq-sched/0]
8 8 FF 129 89 [sirq-block/0]
4 4 FF 129 89 [sirq-high/0]
367 367 FF 76 36 [IRQ-47]
158 158 FF 41 1 [unionfs_siod/0]
156 156 FF 41 1 [kswapd0]
155 155 FF 41 1 [pdflush]
154 154 FF 41 1 [pdflush]
153 153 FF 41 1 [krcupreemptd]
130 130 FF 41 1 [kmmcd]
109 109 FF 41 1 [khubd]
90 90 FF 41 1 [kblockd/0]
17 17 FF 41 1 [khelper]
16 16 FF 41 1 [events/0]
14 14 FF 41 1 [desched/0]
2 2 FF 41 1 [kthreadd]
425 425 TS 24 - [ubifs_bgt0_2]