Why are some of the keys on my p115 not producing sound?
Some of the keys on my Yamaha P115 aren't producing sound when a specific adjacent key is held down. For example, if I was to play every key one by one, they all produce sound. But there is a problem when I hold down a D and then try to play a Eb, the Eb does not sound and vice versa. This also applies the G# and A keys. The problem persists in all octaves and only with these two note pairs.