Audio to midi, pitch bend?

I have tried to vissle a tune and convert this to midi with audio to midi and it works really nicely, but I loose the vibrato, I can see that you can vary the pitch bend range when you do the conversion I have this set to 2, should I increase or decrease this to retain the vibrato?

increasing the number will make variations on your whistling input have more pitch changing effect on the output.

I tried it but nothing changes.
I use variaudio and pith correction, I guess its parameters in the variaudio that removes the vibrato? (I could read the manual, but now I ask you).
Can I use audio to midi without the pitch correction?