Working USB sound card?

[Giuliano Braglia]

2011/3/10 Thomas Orgis <thomas-forum at orgis.org>

> Am Thu, 10 Mar 2011 10:44:49 +0100
> schrieb Giuliano Braglia <forevergyl at gmail.com>:
>
> > I will receive the alesis io2 express next week :)
> >
> > can anyone tell me if I have to do something particular in order to
> install
> > it?
>
> You simply plug in the USB wire (yay for bus power), the "USB" LED should
> light up on the device and the kernel should give a brief note in dmesg:
>
> shell$ dmesg
> usb 3-1: new full speed USB device using uhci_hcd and address 2
> 2:1:1: cannot get freq at ep 0x1
> usbcore: registered new interface driver snd-usb-audio
>
> Then, you should have plain ALSA devices, for audio:
>
> shell$ LANG=C aplay -l
> **** List of PLAYBACK Hardware Devices ****
> card 0: Intel [HDA Intel], device 0: CONEXANT Analog [CONEXANT Analog]
>  Subdevices: 1/1
>  Subdevice #0: subdevice #0
> card 0: Intel [HDA Intel], device 1: Conexant Digital [Conexant Digital]
>  Subdevices: 1/1
>  Subdevice #0: subdevice #0
> card 1: io2 [io|2], device 0: USB Audio [USB Audio]
>  Subdevices: 1/1
>  Subdevice #0: subdevice #0
>
> ... and for MIDI (I had to load the snd-seq module on a custom install, I
> doubt you'll have to do that):
>
> shell$ LANG=C aconnect -o
> client 14: 'Midi Through' [type=kernel]
>    0 'Midi Through Port-0'
> client 20: 'io|2' [type=kernel]
>    0 'io|2 MIDI 1     '
> shell$ LANG=C aconnect -i
> client 0: 'System' [type=kernel]
>    0 'Timer           '
>    1 'Announce        '
> client 14: 'Midi Through' [type=kernel]
>    0 'Midi Through Port-0'
> client 20: 'io|2' [type=kernel]
>    0 'io|2 MIDI 1     '
>
>
> Select the respective ALSA device for JACK to use and you're set. Of course
> you can just use it with ALSA applications, too. Only restriction is, when
> you use the hw device directly, your app must support 24 bit sample format
> (really s24_3, as that is what makes it possible to shift 24bit/48kHz
> through USB 1 reliably). But the default plughw does the necessary
> conversion for you.
>
> I'll quickly test MIDI with hydrogen... using the swissonic USB MIDI
> thingie as thru cable ... yes, I can record and play MIDI from/to my Roland
> drum computer. No idea about jitter, but basic functionality is there.
>
> Really, I'm extremely happy with this box ... no issues, especially
> compared to the hair-pulling I had over getting a system that plays nicely
> with the firewire setup (but then, I don't have 8 analog channels on the
> io|2).
>
>
Cool! It's ok if the restriction is to use it with jack, because that's what
I wanted to do. I think mainly rosegarden and ardour.

I'll keep you up to date.

Thanks

Gyl
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