On Wed, Nov 19, 2008 at 5:16 PM, Matthew Smith <matt@email-addr-hidden> wrote:
> 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
> Linux? Just specify in Jack setup?
>
Should work.
> * Now that I know that I can run USB to MIDI devices through a powered
> 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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Received on Thu Nov 20 04:15:03 2008
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