Converting audio to midi.

Am using Sonar X3 and trying to convert audio to midi.
I am using an audio track from Band in a Box that I transfered in audio to Sonar  X3. When I play this track it works fine.
I want to use one of the Sonar instruments. That is why I want to convert.
 
One of the videos instructing how to do this, uses Melodyne and in the Melodyne screen changes the algorithm from melodic to
polyphonic.
When I follow the procedure I can do everything except that for one reason or other Melodyne does not allow me to go to the
polyphonic tab.
Is there a reason for this?
The person giving the instruction seems to have the same software I am using....Sonar X3.
 
Or is there another way of converting audio to midi.
 
Would appreciate any help.
 
Thank you.
 
Gerry

The version of melodyne doesn't have the polyphony, I believe. I purchased 4.04 directly from melodyne, and the mono/poly is automatic - melodyne 4 can tell the difference. 
 
I do the following:
 
1- open a synth track  beneath the audio track
2- highlight the audio track and click on the region fx tab - 
3- select melodyne, then choose "create" - it will open automatically
4- make whatever adjustments in the melodyne window
5- go back to track view
6- select and drag the audio track and drag it into the synth track
 
it's a VERY powerful tool. I'm a decent trombonist, and I'll often play a part on the trombone in whatever tempo and the trombone range. Then I'll simply pick the instrument i want to play it, and adjust time, octaves, etc. I can play "Flight of the Bumble Bee in quarter notes, and move it to a flute, go up 2 octaves, and multiply the tempo by 4, and there it is. Cello is my usual move, though!!