My PolyBrute is always a 1/2 step out of tune. I have upgraded the firmware, run the calibration procedure multiple times and experimented with manually tuning the oscillators. Manually tuning them works, until I change to another setting, then it's a half step out of tune again. Before I waste any more time trying to make more music with this I need to know if there is a permanent fix, either software or hardware. I could not find a software fix and I do not want to send this unit to whatever repair vendor Arturia users unless they have a fix. If there is none I will request my 3k back from the retailer and move on. Any advice? Thanks, jv