linuxaudio.org

On Wed, Nov 19, 2008 at 5:16 PM, Matthew Smith  wrote:

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> Hi Folks

>

> Whilst my 2.6.24.7-rt17 kernel and disabling all hardware and services

> unneeded for audio seems to have gotten rid of those nasty xruns, I live

> in fear that they will return.  My main worry is how I organise my USB

> devices.

>

> My laptop (ThinkPad Z61m) has 3 USB ports.  I have several devices that

> need to be connected to them, meaning that I need to use USB hubs.

>

> Here are some assumptions (or guesses) that I have made, on which I

> would appreciate comment:

>

> * It would be best to balance the devices across the 3 ports.

>

> * My soundcard is a Behringer UCA202, capable of sampling at a maximum

> of 48kHz @ 16bits x 2 channels.  I'm guessing that this will have the

> greatest data rate of all attached devices.

>  - Should it have its own port?

Yes.  This will probably use more bandwidth than all the other devices combined.
>  - Can USB 2.0 take more than this (like another device?)
No USB 2.0 audio devices have Linux support AFAIK.
>  - Anyone know how to set the sampling rate on this device through

quoted text
>    Linux?  Just specify in Jack setup?

>

Should work.
> * Now that I know that I can run USB to MIDI devices through a powered

quoted text
> hub (thanks David), I was thinking of of hooking the following into a

> 7-port hub:

>  - iPod cable (no iPod on the end, so no burden.)

>  - cellphone cable (as per iPod cable.)

>  - external USB QWERTY keyboard (don't have desk space for this

>    when doing audio work, so hope it won't be transmitting any

>    data.)

>  - trackball (only transmitting when wiggled (I hope) - which should

>    not occur when recording is going on.)

>  - USB floppy drive (not in use when recording.)

>  - USB to MIDI interface

>  - Another USB to MIDI interface - is it too much to have 2 of

>    these on the same hub?  If not, would it take a third?

>

MIDI uses very little bandwidth, should work fine.
Lee

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