Apple Logic Pro /LogicExpress Discussion

I am building a song with a mixture of audio and midi tracks, and -  
not for the first time - I forgot to set the time signature when I  
started. So, I imported my audio tracks, which - of course, are at the  
right speed (and one of which had a basic rhythm track). I then  
recorded some string part fillers using Logic, then came to add the  
rhythm tracks and found out I was in completely the wrong tempo. So  
all of the midi tracks were totally wasted, all of the positioning of  
the audio tracks then came to be out of place and I wasted a few  
hours, all for want of setting the time signature right at the start.

Let it be a warning to others who have less discipline in what they do  
than they really ought to!

Andy