Hi...My JTV 69 has just developed a tuning knob problem. It seems to be limited to the 'model' slot. If I create a new tuning on the guitar or in workbench it will not save to that location. I can save to any other slot (e.g. standard )it's weird. When I connect to Workbench and shift the 5 way switch on the guitar to neck position, sure enough it is shown correctly in workbench...and it shows the alt tuning I have stored there....but it doesn't actually play like that on the guitar. Doesn't help if i try and upload it again to the guitar. any suggestions gratefully received.