My Etherwave Pro's pitch sometimes skews momentarily, as if someone has walked by. It's pretty rare but it happens.
Can this be related to grounding issues or some electric fluctuations in the mains? The power supply in
our building is kind of dodgy with momentary blackouts every few days. I also suspect that the grounding
is not perfect as the theremin sounds good in one room but develops a background buzzing/vibrations in the other.
What are your thoughts, guys? Are ghosts also a possibility?