[linux-audio-user] questions regarding SBLive multichannel use

Russell Hanaghan hanaghan at starband.net
Mon Jan 16 15:57:28 EST 2006


Lee Revell wrote:

>On Mon, 2006-01-16 at 12:24 -0600, Russell Hanaghan wrote:
>  
>
>>Rick Wright wrote:
>>
>>    
>>
>>>Lee Revell wrote:
>>>
>>>      
>>>
>>>>On Sat, 2006-01-14 at 11:56 -0500, Dave Phillips wrote:
>>>> 
>>>>
>>>>        
>>>>
>>>>>Greetings:
>>>>>
>>>>> This question is directed to Lee Revell and anyone who is using or 
>>>>>has tried to use the multichannel capability for the ALSA SBLive 
>>>>>module.
>>>>>
>>>>> When I select multichannel duplex operation in QJackCtl I get 16 
>>>>>channels for input and two channels for output. Is that the default 
>>>>>I/O channel arrangement ?
>>>>>
>>>>>  
>>>>>          
>>>>>
>>>>You should get 16 in and 16 out.  You have to individually select the
>>>>multichannel devices for input (hw:x,2) and output (hw:x,3).
>>>> 
>>>>
>>>>        
>>>>
>>>What Lee said.
>>>
>>>I am using the EMU10K1 driver on both an Audigy2 EX and ZS models.  
>>>These cards both have 6 analog inputs (3 stereo lines) and the EX is 
>>>6.1 out (7 analog outputs) and the ZS is 7.1 out (8 analog outputs).  
>>>I have worked out the mapping from the pcm_capture and pcm_playback 
>>>ports to the physical analog inputs and outputs which I will share if 
>>>you are interested.
>>>
>>>The only problem I found is that the alsa-mixer volume control sliders 
>>>are left-right switched for all of the stereo output pairs.  I mean, 
>>>if you plug a standard 1/8" stereo-to-RCA cable into the stereo output 
>>>on the card, the appropriate left slider controls the signal on the 
>>>red RCA plug - which is typically the right channel - and vice versa.  
>>>This is true for all stereo output pairs.
>>>
>>>I reported this bug to the ALSA bugtracker about a year ago 
>>>(https://bugtrack.alsa-project.org/alsa-bug/view.php?id=904), but the 
>>>behavior persists....
>>>
>>>Rick
>>>
>>>
>>>      
>>>
>>Does this work on older SBlive 5.1 cards as well?
>>    
>>
>
>Yes, it works on everything supported by the emu10k1 driver, all the way
>back to the SBLive! PCI 512.
>
>Lee
>
>
>  
>
Cool! Thanks Lee.

I know I've seen stuff about this previous and you have long been a 
supporter of the usefulness of SB cards. I guess it's nice to know that 
I have about 5 SBlive 5.1 (about $19.00 for the OEM version) laying 
around that are multi channel cards of sorts! :)

R~



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