[alsa-devel] M-Audio FastTrack C400

Chris Cavey chris-alsa at rauros.net
Sat Apr 21 18:07:37 CEST 2012

speaker-test plughw:C400 got me further but complains still

Setting of hwparams failed: Invalid argument

 From the manual:

2 analog mono inputs, 1 stereo SPDIF gives a total 4 inputs
4 analog mono outputs, 1 stereo SPDIF gives a total 6 outputs

Does SPDIF factor into channels?

I noticed, the endpoint attributes are slightly different that the FTU. 
Could this be an issue? I'm also guessing that the mixer lacking 
channels is probably an issue. I wonder if the some the FTU mixer 
"workarounds" may fit.

On 4/21/2012 5:19 AM, Grant Diffey wrote:
>>> (channels = 2, ifnum = 2).
>> Why do you use channels=2. As fas as I can tell the device has 6
>> channels. Try that.
>>> Except I can't get it to play anything (figure it would all be too good
>>> to be true)
>>> $ speaker-test -Dfront:C400
>>> speaker-test 1.0.25
>>> Playback device is front:C400
>>> Stream parameters are 48000Hz, S16_LE, 1 channels
>>> Using 16 octaves of pink noise
>>> Sample format not available for playback: Invalid argument
>>> Setting of hwparams failed: Invalid argument
>> The device probably supports only S24_3LE audio. At least that's what
>> you tell Alsa with the FTU quirk. Try to play something through the
>> corresponding hw device or use Jack or convert some audio file to
>> S24_3LE and play through aplay etc...
> that's a good point
> try speaker-test -D plughw:C400
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