Not really enough info....
Have you any other MIDI device that can be attached to the MIDI out of the SB card to see if it's the interface, and have you told what ever sequencer program you are using to send to 'SB MIDI out (1000)'?
Does the MIDI recieve LED on the S-760 light at all?
Does the S-760 receive MIDI if played from a seperate MIDI keyboard?
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The Sonic Energy Authority - a sound investment
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The Sonic Energy Authority - a sound investment