Hi I am trying to generate tones using computer software. I generated a sine wave tone for a frequency of 261.63 Hz, corresponding to middle-C key on a keyboard/piano. But this sound produced is completely different from when I generate it on the instrument. Shouldn't all the sounds of same frequencies sound the same? :grumpy: Could the difference be because of the specific software I am using (and not something wrong with naturally occurring sound waves ) ?