try this:
"MIDI Devices Aren't Being Recognised?
(Friday, 11 May 2007) -
If you have an application that can be controlled by a MIDI device, but that application doesn`t see one or more of your devices, try the following fix.This fix involved using Regedit to delete the UpperFilters and LowerFilters registry values. BE CAREFULL messing around in your registry, as you can damage your OS.To Manually delete the
UpperFilters and LowerFilters registry values, follow these steps:
1. Start Registry Editor (Regedit.exe).START > RUN >(Type) REGEDIT (and hit ENTER)
2. Go to File > Export and save a backup file to somewhere on your computer (you can
delete this backup file later if you determine that all is well).
3. Locate the UpperFilters and LowerFilters value under the
following key in the registry HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Contro l\Class\{4D36E96C-E325-
11CE-BFC1-08002BE10318}
4. On the Edit menu, click Delete, and then click OK. You may or may not need to unplug
and then reconnect the MIDI device after deleting these values.
This fix has been reported to work by several users now."
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