[PlanetCCRMA] Tascam US-122 audio problem

Ben Cohen benedict1000@yahoo.co.uk
Tue Feb 22 11:39:02 2005

Thanks for the reply Jason, you've cleared a lot of
things up. I added the following lines to
modprobe.conf but I didn't notice any changes (was I
meant to?):

alias snd-card-1 snd-usb-usx2y
options snd-usb-usx2y index=1 nrpacks=4
options add -k snd-card-1

I'm using jack 0.99.36 with (qjackctl) is I guess I
can't use the low latency with nrpacks=1.

I'm expect the device to show up in jack as additonal
alsa input/output ports. Is this correct?


 --- jason.ronallo@gmail.com wrote: 
> Ben,
> Replying off-list.  Please summarize on list if this
> is helpful.
> I have a US-122.
> The only controls for this are hardware.  That it
> shows up in qamix is
> a good thing since you know that it's recognized,
> but there shouldn't
> be any controls there.
> You won't be able to use alsaconf to configure the
> card as far as I know.
> You should configure your modprobe.conf file
> (probably
> /etc/modprobe.conf) to contain the following lines
> (where N is the
> number of the card, N=1 would be the second card):
>   alias snd-card-N snd-usb-usx2y
>   options snd-usb-usx2y index=N nrpacks=1
>   options add -k snd-card-N
> About that nrpacks=1 bit.  You might change that to
> nrpacks=4
> depending on what kernel and version of jack you are
> running.  If
> you've got a very recent realtime kernel and jack
> 0.99.44+ (me thinks)
> then you can use the rawusb hwdep experimental
> driver to achieve nice
> low latencies, but only if you have nrpacks=1. 
> nrpacks=4 will work
> more stably for older realtime kernels.
> Are you using jack?  Then I can probably help more. 
> I haven't tried
> to use it without jack, since my internal soundcard
> on my laptop is
> enough for regular use, but I'm sure it can be used
> just under alsa.
> Do a search for Rui Nuno Capela or rncbc and Tascam
> and you should
> find out a lot more about these Tascam cards under
> Linux and their
> history.  He's got another model and has really been
> the one who
> pushed for support for them.
> Let me know if you need any more help with this one.
>  I'm grateful for
> those who've helped me get it up and running.
> --Jason

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