On Wed, Nov 19, 2008 at 5:16 PM, Matthew Smith <matt@xxxxxxxxxxxxxx> 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 _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/mailman/listinfo/linux-audio-user
