Re: [Line6linux-devel] Sample rate in GuitarPort XT

[Markus G. <gr...@ic...>]

On Friday 06 January 2012 00:40:47 Пупков Евгений wrote:
> Hello! My name is Eugeny, I'm from Novosibirsk, Siberia,
> Russia. I'm a user of Line 6 GuitarPort in Ubuntu Studio
> 11.10. It comes with line6usb module (0.9.1 beta).
> Generally, it works fine, thank you for your work! With
> It, I can easily play my guitar connected to guitarix via
> Jack, and record some demo songs=)
> But couple of days ago I decided to make some recordings
> with better quality. So, I've just configured 48000 sample
> rate instead of 44100 in qJackctl, wanted to setup 24bit
> quality, but it doesn't work. qJackctl's indicator shows
> 44100 sample rate, and ardour creates a session with the
> same value.
> 
> I've googled a lot, and found some information.
> 1) In a driver manual I've found that native sample rate
> of line6 devices is 39062,5 , and all conversions should
> be done by either ALSA, or some software. But writing
> plughw instead of hw made JACK not to start.
That was probably written by me :-)
As far as I know, It only refers to the POD devices before the X3.

> 2) Here
> https://sourceforge.net/projects/line6linux/forums/forum/713264/topic/227328
> 3 I've found that GuitarPort only supports 44100 and 16bit
> sample rate. This topic is three years old, may be
> situation has changed, I don't know...
> 3) But in official GearBox recording manual I've found
> that "TonePort and GuitarPort natively support 44100 and
> 48000 Hz sample rates. They will
> also support 88200 and 96000 Hz, but will perform a sample
> rate conversion process to do so." I understand that this
> manual is only for Mac and Windows users, but it gives me
> a hope...
> 
> My question is
> Do the words in point 3 mean, that there is a hardware
> support for 48000 Hz in GuitarPort? And if answer is
> "yes", do you plan to make your driver work with GP on
> this sample rate, or may be newer versions of driver
> already support 48 MHz?
I'm sorry, 48MHz won't ever be supported :-), but there is some experimental 
code for 48kHz support:

https://line6linux.svn.sourceforge.net/svnroot/line6linux/driver/branches/ux8

The branch has been created for testing a UX8 implementation, but also has 
some other stuff, including the 48kHz support for some TonePort-like devices. 
The latest commit has not yet been tested, so you might have to revert to 
revision 849, but this is probably what you are looking for.

Could you please test this version of the driver and provide feedback if it 
works for you? And may I ask you to do some additional testing once this 
branch has been merged back into the trunk (don't know when this will happen, 
though)?

	Thanks & kind regards,
		Markus


-- 
Markus Grabner
Institute for Computer Graphics and Vision
Graz University of Technology, Inffeldgasse 16a/II, 8010 Graz, Austria
WWW: http://www.icg.tugraz.at/Members/grabner