one of the 6 voices of the osc2 sounds different

[lorensito]

Hello everone, i have a bizarre problem on my OB 6...

When i init patch, one of the 6 voices of the osc2 sounds different from the 5 others (like more clear, more opened filter) . My firmware is 1.8 I don't know if change to the previous version can change anything at this problem or if it's a hardware default...it's yet another problem, in any case thank you for your help ;-)