Ok,today i rehitted some solder joints and with a Kawai drum machine the midi in works fine. But when i connect the kawai output to the xoxbox´s mix in the sequencer stops working.
When i tried to sync the xoxbox to the computer without a plug in the mix out works fine but when i plug the jack the sequencer suddenly stop.
There´s no copper bits and solder joints are ok.
At the shield, the resistance doesn´t show any value-
Strange problem ,isn´t it?