Duane, have you tried a different song to see if they all crash when you try to slow down the music?
If I remember correctly, the Vixen Tutorial videos on YouTube shown how to put in a beat track the hard way... opening up the Sequence menu and choosing the Audio option, and using Ctrl to set up the beats. If you wanted to re-do the beat track of only a certain part of the song, it's a pain to find the right time to move the slider to as well. I also found that it was sometimes hard to get the timing right when a song is playing at full speed.
When I found the Space Bar trick (totally by accident) that others here have mentioned, it saved me so much time. I realized that you can slow down the music to make getting the timing easier and more accurate--a godsend if you're trying to get timing right on extremely fast songs.
Another useful tip that you may not know about is that if you highlight an area you want to play, and choose the "Play Only the Selected Range" option, and can turn on the "Loop This Sequence" option, you can play the same section over and over again to get the timing right in your head, and when your hand is ready, you can use the Space Bar.
I also noticed that once you've finished using the Space bar to get your timing in, if you keep playing the same loop over and over, you can do even more fine tuning by double clicking in each square with your mouse to turn it on or off. Very handy.
When I did my first ever sequence in Vixen, I was never very happy with my timing. As time went on and I discovered this new technique, not only was I able to do very accurate beat timings, I was able to hit individual song notes with great accuracy as well.
Here's an example with my arches:
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LoginHere's an example with my light poles:
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LoginThe downside is that sequencing a song takes much longer.