Triode wrote: 
> MDAC is a usb 1.1 device which requires a "transaction translator"
> function to support it on a usb2 port.  Unfortunately the usb port on
> Touch (and many other ARM based processors) has a limited functionality
> transaction translator which doesn't work well with async dacs.  Adding
> the high speed hub adds a real transaction translator and makes it
> work..  [usb2 dacs don't need this as they don't need translation]
> 
> 
> This should now be fixed, but the dac needs to be turned on when the
> Touch is started.  You should be able to turn it off while leaving the
> touch running though.


Thanks for the replies.


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