[linux-audio-user] USB Quattro and Jack questions

Patrick Shirkey pshirkey at boosthardware.com
Tue May 27 14:42:01 EDT 2003

Patrick Shirkey wrote:
> Frank Barknecht wrote:
>> Hallo,
>> Austin hat gesagt: // Austin wrote:
>>> On 2003.05.27 07:42, Patrick Shirkey wrote:
>>>> It's highly unlikely that jack and usb will work well with low lat 
>>>> at any sample rate.
>>> I was leaning towards the quattro USB.  Are you saying you've NEVER 
>>> been able to record four channels without dropouts?  Are you guessing 
>>> the PCI version (whatever it's called) would have fewer dropouts with 
>>> jack?
>> I don't think, that this is what Patrick meant. USB is not really
>> suited for very low latency applications because of how the bus
>> handles the data transport. But with a bit higher latency settings, it
>> is no problem to record or play 4 channels without dropouts on the
>> Quattro. Nevertheless PCI is better, but not an option on a laptop.
>> For a standalone machine, I'd highly recommend a 'real' card.
> Another thing about the quattro is that even the windows drivers will 
> not allow you to record and playback on all 4 channels at one time.
> You can use
> 4 in, 2 out 48khz 24 bit
> 2 in, 4 out
> 2 in, 2 out 94 khz 24 bit
> I think I am running up against this with my latest attempts. It may be 
> that the quattro cannot do all 8 channels because of a hardware switch 
> maybe for power consumption or something. They do run awfully hot and I 
> can imagine that it would be possible to melt something if their is too 
> much power running through them.

I have just found out that it is the input 3 and 4 that now work in full 
duplex mode with 4 outputs. I guess this is backwards but don't know for 
sure. The sound is still fucked at the mo but that's definitely jack 
apps acting funny.

Patrick Shirkey - Boost Hardware Ltd.
Http://www.djcj.org - The Linux Audio Users guide

Being on stage with the band in front of crowds shouting, "Get off! No! 
We want normal music!", I think that was more like acting than anything 
I've ever done.

Goldie, 8 Nov, 2002
The Scotsman

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