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My Edirol UA-20’s audio drivers work fine in both standard and advanced mode, but the MIDI port is not working in Windows XP.

My UA-20’s audio drivers work fine in both standard and advanced mode, but the MIDI port is not working. I followed the guidelines to install the drivers but it fails. When inserting the UA-20 Windows will choose its own WDM driver and the install wizard never comes up. I have tried to uninstall the driver but the same scenario happens, Windows’ own driver is chosen automatically. The manual says that if I have this problem I should contact EDIROL.

Windows XP is very picky, so you must be certain to install the driver correctly the very first time, otherwise after a few failed attempts at it Windows will start to misbehave. Double-check the walkthrough below if your driver installs fine but the MIDI ports don’t appear in MIDI software.

Problem Description: USB drivers installed correctly but cannot see audio or MIDI ports in recording software. The problem is caused by a 10 USB driver limitation in Windows XP/2000.

Click on “Start” and choose “Run,” then type in “cmd” as the command line. Click “OK” and a DOS prompt will open. Type the following commands one line at a time, hitting enter after each:

set devmgr_show_nonpresent_devices=1
start devmgmt.msc

The Device Manager will now open up, so click on the View menu and choose “Show Hidden Devices.”

Look through the device manager carefully and note that there are a lot of drivers with a kind of translucent colored icon next to them. These are what are called “ghosting” or otherwise nonpresent drivers your computer is remembering in case you were to ever use the device again later. They can also be drivers that do system functions and are hidden by default, or partially installed or corrupted driver install attempts, all sorts of things really.

Look under these categories in particular:

+Human Interface Devices
+Other Devices
+Sound, video and game controllers
+Universal serial bus controllers

Obviously you would want to uninstall any driver that shouldn’t be there, but pay particular attention to things like these:

USB Composite Device
Composite USB Device
USB Audio Device
USB Human Interface Device
USB Device
Unknown Device
*3rd party USB drivers no longer in use or installed multiple times.
*Edirol drivers you are having problems installing.

Delete these or any driver duplicates and then restart your computer. After you have completed these instructions your Edirol driver should be reinstalled to end the procedure. MIDI and audio ports will then be visible in your software.

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