Computer Audio Asylum

Music servers and other computer based digital audio technologies.

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Original Message

There is no reason not to use two USB devices at once

Posted by Presto on June 27, 2011 at 14:35:57:
You just need to know how to do "USB Channel Mapping".

In Windows, you go to the device manager under USB controllers. To do this, you will need to view Devices by Type.

Then, once you know which USB ports go to which controller host, you can view Resources by Connection.

Pick a unique host controller with a unique interrupt request for your audio drive AND for your USB audio device.

If you need a USB expansion card (PCE or PCI) then get one. If you get massive dropouts or glitches identify the expansion card's chipset. Some say one is better than the other but sometimes it just depends on the hardware you are using (and it's drivers).

Usually with USB where there is a will, there is a way. The USB troubleshooting method is not super complex but few seem to know even the most basic of steps to avoid resource conflicts and spits and sputters. The right USB expansion card can often save a LOT of time and effort and it gets you an additional interrupt because it's not treated like a USB host controller but really an individual PCI/E card. This can be a big advantage if you're out of IRQs or simply cannot remap them as you need to. There are also programs out there than can re-map IRQs but this is for advanced users - use at your own risk and back up your computer first or at least set a restore point.