OBERHEIM SYNTH

Hello,

i have a question about an Oberheim OB8 Synthesizer. This unit have a bad voice - but this in not the problem in this time. there is problem with the auto tune , after switching on, some sounds of the internal programms sounds ok - some not -strange sounds ...

when i play the programs which sounds "normal" the voices get out of tune a little bit, thing this is normal. but - when i press the auto tune button, the ob will beginn to tune each voice, after finishing all LEDS on the frontpanel will flash and then, after this, no more sounds
come out of the ob8, i can change the programs, but there is no sound .... when i try in this situation the modifiy the program with cutoff, attack, decay , nothing happens, no sound ...

this is strange, the only way to play the ob8 again is to switch of the synth and switch on again...

anyone have an idea ?

greetz

Phil