OK, well connect your interface and let's get going. Connect the USB to your computer, and connect the MIDI Out lead to the D-10's MIDI In socket and the MIDI In lead to the D-10's MIDI Out socket.
You will probably need drivers for the PC to see your USB-MIDI lead. Which one did you get? I might be able to download the manual.
Go to My Computer>Local Disk(C)>Programs>MIDIOX
Inside the MIDIOX folder there will be a whole list of stuff. Double-click on the one that says "midiox" that has a symbol with a red-stripe (if it's big enough it looks like a Swiss army knife).
Once that's up and running you should have a small box with various menu options on its top row. Click "Options" and select "MIDI Devices" from the drop-down menu. This is the bit that may take a little bit of messing about with but hopefully you should see some MIDI in and out ports. Highlight them and click OK. We may have to come back to this section.
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Once you get that bit working, the transfer is very easy. Download the System Exclusive date from here:
http://www.synthzone.com/midi/roland/d10/D20_syx.zip
The file you want after you unzip it is d20factd.syx (factd). Once you know how to load this you can try experimenting loading the other files which have different sounds, knowing that you can always get back to the factory settings by reloading thed20factd.syx file.
In MIDI-OX select Actions>Send>SysEx File. Use the browser window that opens to navigate to where you have the d20factd file. Once you highlight that file and hit OK it will be sent to your D10. Hopefully your D-10 will give some indication that it is receiving the file and that should be it. We may have to adjust some buffer speeds to slow down the send if you get any errors, but we'll worry about that later if needed.
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You may have to set up the D-10 to receive this data. I got this from the internet on how to do it:
Loading Instructions for the D-5/D-10/D-20 Multi Timbral Linear Synthesizer
1) Set the Exc Unit # by pressing MIDI, then either DISPLAY button until the parameter is shown. [this is usually 17]
2) To load the data, press Data Transfer, then press either Display button until the screen says One Way Bulk.
3) Press the right cursor to select Load. Press either cursor to select All. Press Enter. Press Write to turn off memory protect.
4) Press Enter and start Media Player or your sequencer. [MIDI-Ox in our case]
5) The unit should respond with 'Loading' and will return to the previous mode when completed.