Today I was practicng and wanted to see if I was in tune. So I pulled out my Korg Chromatic Tuner CA-30 and began tuning. It turned I was out of tune, flat. So I push in the tuning slide a little, tried again and still, flat. So I ended up pushing the tuning slide all the way in! And still it read B or Bb when I played a low C! The tuner is at 440 Hz, which I think is normal. Every note I played seemed to be flat! My piano is even out of tune so I cant't depend on that!lol
My director told me last year, that sometimes the humidity can play a major role in being in or out of tune. My house is only around 60% humidity. My trumpet should always be at room temp., because I have it stand 24/7! I don't even think the tuner is reading Concert-wise, because when I push any key my piano it reads the note I played (But it reads it being either b or #). So I have no clue as to what to do next! In school it seemed to be fine, when I was in band class. I don't think it's my tuner, maybe my trumpet or the weather is affecting it!
So if anybody knows what's going on I'd really appreciate it!