Hello everyone. Advice would be very, very welcome. I have encountered a new and sudden problem with X1 Producer: whatever audio tracks I add quickly change tempo. For example, I recorded a drum track direct from my Tyros 2 which, to my ears, sounded in time. But on playback, round about 1min 11 secs, the tempo drops, rendering it useless. This is happening with everything I record. As a test, I muted everything within the project and pressed play, keeping the metronome. And this kept perfect time with my Tyros, which seems to suggest that the problem lies within the software. Can any of you wonderful people help?
Mark
*** HAVE JUST TRIED TO RECORD WITH THE AUDIO METRONOME PLAYING. ALTHOUGH IT KEPT TIME WHEN I PREVIOUSLY PRESSED PLAY, NOW THAT I HAVE PRESSED RECORD, IT HAS GONE OUT OF SYNC. AND, STRANGELY, IT HAS HAPPENED AT THE SAME POINT IN THE TRACK (1min 11secs). TO SAY I AM CONFUSED WOULD BE AN UNDERSTATEMENT!

Is the sample rate the same between Sonar and your interface?

Yes it is. I use an Edirol UA-4FX. Both are set to 44100. I tried changing them but Sonar automatically reset it. I have considered the possibility that the fault lies with my Tyros 2, but the tempo sounds constant and, certainly, the tempo change within Sonar is very noticeable. 
The only changes in the past couple of days have been a Windows Update and setting up my daughter's new MP3 player. I am totally flummoxed.
Mark

Is this in every project or a specific one?
Does it also happen when your Tyros is not connected via midi?

Hello again.Thank you for your help.
After the problem raised its ugly head, I created a new project. But the issue happened again.
My Tyros is connected via audio leads. (I don't use MIDI, purely because I have never been able to understand it! If I come across as being technically-bereft, it's because I am. But this audio method has served me reasonably well, with two backing-tracks to be used in their entirety on forthcoming albums by successful artistes).
I have examined all the settings, and cannot locate the cause of the issue.
Mark 

Strange. Does the tempo change always happen at the same place in the song? If it does, do you see the tempo change in the tempo field in Sonar?

EDIT: What I'm getting at is that there may be some automated tempo changes, perhaps in the project tempo track? If you're particularly unlucky this might somehow have gotten saved in the blank project template meaning it will affect any new project started from that template.

Anything untoward in the tempo map? (Alt+Shift+5)
Or in the Event list? (Alt+8)

You are very kind.
I am going to take a close look now and see what I can find, based upon your suggestions.
Mark

Hi. I can see nothing untoward in the tempo map or event list. One thing however: I played an auto-accompaniment on the Tyros and recorded it with X1 with the audio metronome: all seemed to go well until I manually played a new chord - and that's when the two went out of sync. Could this be that my Tyros is on the way out?
Mark
P.S. HAVE TRIED A NEW RHYTHM, DIFFERENT TEMPO, AND RECORDED IT WHILE CONSTANTLY CHANGING CHORDS. BUT THIS HAS NOT AFFECTED ANYTHING!!! THIS IS BIZARRE.

I have tested this by using the same accompaniment, but without any chord changes. As I was recording, I could clearly hear the tempo go out of sync round about 1min 20secs.
Now, is this because the Tyros is getting old, the tempo has failed, but because it is fractional, it takes a while for it to become obvious?