Hello, I'm looking for some help in repair of my Omnichord. As it was previously used, it has some problems -- few buttons were removed so they can't produce any sound but the real issue starts when it goes to the Touch Plate. OM reacts to the touch but there is no sound, only sort of tapping from speaker. Out of curiosity I opened the Omni because I though that maybe it's dirty inside but it's all clean. The problem is that I felt a smell of something melted... What could it be?