Subject: Re: [linux-audio-user] USB Quattro and Jack questions
From: Patrick Shirkey (pshirkey_AT_boosthardware.com)
Date: Tue May 27 2003 - 21:15:25 EEST
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.boosthardware.com 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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