I was reading the Larry Teal book, and he appears to imply that vibrato oscillates down, back up above the pitch and down again, so that the "basic" or "average" pitch is in the middle of the waveform.
I suppose this would work well for a singer, but I'm sure most saxophone players oscillate down from the pitch then back up to it, rarely going above the starting pitch.
You would think that this would make the pitch of a vibrato note sound flat: if you play a note without vibrato, then add the vib halfway through, the average pitch of the oscilation would be lower, but I don't hear it as sounding flat, even p;ayers with a quite an exaggerated vibrato such as Earl Bostic.
This is with the oscillations below the pitch:
And with both below and above, so the "average pitch" is not flattened:
I suppose this would work well for a singer, but I'm sure most saxophone players oscillate down from the pitch then back up to it, rarely going above the starting pitch.
You would think that this would make the pitch of a vibrato note sound flat: if you play a note without vibrato, then add the vib halfway through, the average pitch of the oscilation would be lower, but I don't hear it as sounding flat, even p;ayers with a quite an exaggerated vibrato such as Earl Bostic.
This is with the oscillations below the pitch:
And with both below and above, so the "average pitch" is not flattened: