ok this is what i got from Pianoteq,doesnt really help ,any ideas,
"Hi Justin,
The midi files exported by Pianoteq do not contain any tempo or time
signature information, the hosts just picks some default values (120bpm
4/4)."

It is possible to write a MIDI file with no tempo information in it. If that's the case, it should play at the correct tempo when SONAR is set to 91BPM, regardless of whether you import it into an existing project at that tempo or open/import it into a project with some other tempo and change it to 91.
 
But you mentioned in your OP that the tempo is "all over the place", so I'm thinking that means you're going to have some work to do to align the timeline to it in any case.
 
How did you come up with the 91 figure? Is that what Pianoteq was set to, and you played to a click but did not keep good time?
 
If the standalone Pianoteq can render audio, importing the audio into SONAR will allow you to use Audiosnap or Set Measure/Beat At Now to figure out what the tempo really is.

Hi Brundlefly,
I know its 91 because i played with a click track but the timing is a bit sloppy because I was writing off the top of my head.I saw another post of yours which has fixed the problem for me.
"Snap the Now time to the last measure , hit Shift+M to bring up Set Measure/Beat At Now, enter a measure (greater or less in my case as I have quite a few midi files that need adjusting) and OK.
 SONAR will change the tempo to  around the MIDI without altering its absolute playback timing."
Perfect with a bit of trial and error on my part.
Thanks heaps