Doepfer

The A110 and A111 CAN be calibrated to very accurate standards.  I 
spend a couple of hours every few months checking such things, and 
set mine up to track to the cent for 6 full octaves (check with Doug 
at Sonic Highway if you think I'm stretching the truth).

That said, I know 6 octaves is anal, but...

Regards,
Kevin