Gretchen is correct...
Furthermore different instruments WILL produce different sounds for the same pitch because they are made of different materials. Materials in instrument A has various sound-wave qualities that differ from instruments B, C and D. This is why an A note
plucked on an acoustic guitar sounds different as compared to the same exact A note blown through say a trumpet. The guitar is mostly made of wood and the trumpet is made of brass metal. Wood and metal have different sound qualities. Furthermore an A note
plucked on an acoustic guitar sounds different as compared to the same exact A note that is plucked on an electric guitar because of the soundhole on the acoustic guitar which vibrates air molecules slightly different from that produced by the electric guitar
The physics of sound wave theory is beyond the scope of this discussion but an instrument's sound quality can be computed mathimatically by it's Fourier series which reveals odd and even harmonics associated with a tone produced by instrument A. The Fourier
series of odd and even harmonics will be different between instruments for the same exact pitch note played , - like an A note.
In addition a guitar can be made to sound the same note (say A note) differently depending on the techniques applied before plucking the note. Guitar attack on plucked notes is high, - so a technique called "volume swell" in which the guitarist plucks
the note with volume OFF and then turns UP the volume will dampen the attack of this plucked A note; - thereby creating a different sound quality.
-Albert B. West Nyack NY