Al seguente link troverete un testo contenente le istruzioni su come impostare il programma per il corretto funzionamento con una tastiera MIDI usb collegata al pc.
ho installato Asio4all ma andando in Impostazioni generali/midi non viene comunque riconosciuta la tastiera... nonostante sia quella che teoricamente dovrebbe andare alla grande con MMM17....
questa è la soluzione che ho avuto dal produttore della tastiera: innanzitutto disinstallare eventuali programmi Logitech (videocamere etc)
first unsinstall logitech prog (but it was still not working)
then
" Go into the registry editor (go to Start Menu, Run and type regedit)
2. Go to this location: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Contro l\Class\{4D36E96C-E325-11CE-BFC1-08002BE10318} and delete the two items "LowerFilters" and "UpperFilters"
3. Go to this location: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Contro l\Class\{6BDD1FC6-810F-11DO-BEC7-08002BE2092F} and delete the item "LowerFilters"
4. Go to this location: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Contro l\Class\{6BDD1FC5-810F-11DO-BEC7-08002BE2092F} and delete the item "UpperFilters"
5. Move back to the root of HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Contro l\Class\
6. Launch a search (i.e Ctrl F with the option to search in "Data") and type "LVUSBSTA". For any place found (only in the "Control\Class" area), just delete the "LowerFilters" item (it is the item that contain the value LVUSBSTA found). For me, I didn't find any other places than the ones mentioned here.
7. Then uninstall the midi device driver, unplug it and plug it back in. Windows should recognise it and install it and it should work!"
Here is a link to a forum, which reported the fault: