uaudio - distorted output

[Gary Jennejohn]

On Tue, 10 Oct 2017 20:14:37 +0200
Alexander Leidinger <Alexander at leidinger.net> wrote:

> Quoting Hans Petter Selasky <hps at selasky.org> (from Mon, 9 Oct 2017 22:38:32 +0200):
> 
> > On 10/09/17 21:47, Alexander Leidinger wrote:  
> >>> If you are using multi channel audio equipment with 24-bits, try >>> to avoid FULL-speed ones!  
> 
> I have now tried every single USB connector, external and internal. None of them attaches to the EHCI bus. :( The only connector which Iwas not able to test is labeled "USB SSD" and has a smaller pin-gridthan those other internal usb-PIN-connectors with cables to the frontof the case.
> 
> I think I will now buy a PCIe USB3.0 card. Anything I should avoid? Anything you recommend? I found this:
>     www.amazon.de/CSL-Express-Controller-SATA-Stromanschluss-Schnittstellenkart
> e/dp/B00OBACW0G
> which seems to have some VLI chip on it. I haven't found anything usable in terms of vendor/product ID or such.
> 4 ports may be enough, for an external USB backup HD, the soundcard, and a video device, but for ~10 EUR difference...
> 

I've been using the CSL B00F9XGPTI XHCI 4-port card which works.  I
bought it on amazon.de, but I don't know whether it's still available.

> >> Well... first I want to get the 2 channel 16bit case working... >> then I will have a look at extending this to 5.1 (most probably >> 16bit, that's enough to watch action movies).  
> >
> > Hi,
> >
> > Some more ideas:
> >
> > 2 channel 16 bit will only work if you turn off bitperfect. The  
> 
> I activated bitperfect as a test because I got the distortion and was hoping to either gain some lower-latency or at least get rid of somelayers of code to rule out issues there.
> 
> > lowest number of channels the device exports is 4 for playback. That> means the kernel will re-format 2 channels to 4 channels always and> that is done by the PCM feeder. You'll need to check that there is a> filter which handle that.
> >
> > You might want to install virtual_oss from ports to handle this > device properly.  
> 
> In the end I want 5.1 output, so if the bus speed doesn't give me this: no need to waste our time with the slow ports.
> 
> Bye,
> Alexander.
> 
> -- 
> http://www.Leidinger.net Alexander at Leidinger.net: PGP 0x8F31830F9F2772BF
> http://www.FreeBSD.org    netchild at FreeBSD.org  : PGP 0x8F31830F9F2772BF


-- 
Gary Jennejohn