Instructions for connecting USB DAC to Touch

[Triode]

Does anyone here have a USB Audio Class 2 dac?? If so I would be interested in what happens with my kernel #3 in the usb dac experiement thread. I can't test as I don't have the appropriate dac, but I think I've included the more recent linux changes which _may_ allow class 2 dacs to do something.

[realmadrid]

Hi Triode:

Look at:

http://www.qnktc.com/ab_11/
Works very well on Vortexbox

Regards

Juan

[Triode]

Hi Triode:

Look at:

http://www.qnktc.com/ab_11/
Works very well on Vortexbox

Regards

Juan

So if you have one - could you try it on Touch with my kernel and let me know how you get on? I'm not looking to buy one, I was hoping people here would have usb audio class 2 dacs they could try with touch and help us make it work.

[dahmwern]

So, I've got a Twisted Pear Audio Opus DAC with their USB receiver. Soon I'll be switching this over to have the S/PDIF receiver with TOSLINK however until my ODAC comes (supports 24/96 unlike the TPA USB receiver) all I've got is this DAC. I got it working with no ticks or pops thanks to the solution on page 12. However, I tried Soudcheck's TT 3.0 mod and then I couldn't get USB working again.

Can someone help me out on how I can have both going at the same time?

[rgro]

So, I've got a Twisted Pear Audio Opus DAC with their USB receiver. Soon I'll be switching this over to have the S/PDIF receiver with TOSLINK however until my ODAC comes (supports 24/96 unlike the TPA USB receiver) all I've got is this DAC. I got it working with no ticks or pops thanks to the solution on page 12. However, I tried Soudcheck's TT 3.0 mod and then I couldn't get USB working again.

Can someone help me out on how I can have both going at the same time?

Try disabling or commenting out the entire tt 3.0 priority section for starters. Or, alternatively, you can copy/paste into the tt 3.0 file the new priority section that SBGK has developed here:

http://touchsgotrythm.blogspot.co.uk/

[dahmwern]

I wonder if I could just do this using a USB Hub? I'm not really sure how a USB hub solves ticks and pops if its just a pass through...

http://forums.slimdevices.com/showth...-Digital-Ouput

It looks like you can do TT3.0 and EDO at the same time, though I think that would interfere with one another. I'll have to try it out sometime.

[rgro]

I wonder if I could just do this using a USB Hub? I'm not really sure how a USB hub solves ticks and pops if its just a pass through...

http://forums.slimdevices.com/showth...-Digital-Ouput

It looks like you can do TT3.0 and EDO at the same time, though I think that would interfere with one another. I'll have to try it out sometime.

You could try a hub, but I doubt it'll solve the issue of EDO and TT 3.0 working together. EDO and TT 3.0 will work together just fine if you modifiy or eliminate the TT 3.0 priority section.

[dahmwern]

You could try a hub, but I doubt it'll solve the issue of EDO and TT 3.0 working together. EDO and TT 3.0 will work together just fine if you modifiy or eliminate the TT 3.0 priority section.

I think the idea of the USB hub was to eliminate the ticks and pops, outside of EDO itself. However, I just discovered EDO and others probably know more than I do about this. Sorry if this has been covered many times, and if it has just let me know and I'll find it on my own, but has the USB hub trick been proven to work?


EDIT: EDO + USB 2.0 hub works for me.

[JohnSwenson]

I think the idea of the USB hub was to eliminate the ticks and pops, outside of EDO itself. However, I just discovered EDO and others probably know more than I do about this. Sorry if this has been covered many times, and if it has just let me know and I'll find it on my own, but has the USB hub trick been proven to work?


EDIT: EDO + USB 2.0 hub works for me.

The reason for the hub is that there seems to be a bug in the Touch hardware that prevents asynchronous USB from working properly with a DAC that uses full speed mode. Asynch works fine when using high speed mode, so the hub talks high speed to the Touch, and full speed to the DAC and everybody is happy.

The hub fix will work with the approaches posted in this thread, but the EDO applet makes using a USB DAC MUCH easier than hacking up your alsa files. The stuff in this thread should just quietly go away now that Triode has done it right.

John S.