Stacked bars and negatives

hello all,
I'm having an issue with stacked bars.
When a value in negative it actually treats it as a positive when drawing the graph!
As an example:
1
2
5
-4
Will bring the bar up to 12 instead of 4.
Any ideas?
Thanks,

I usually put a 30sec black slug after the tone and bars. Any idea how to do that? I can insert a gap ok but can't seem to set it's end point to 30sec duration.
Ooops - sorry Frank - I went to Mark's Rippletraining site and thought it was he who'd posted the link . Thanks for that pointer! Looks like an interesting resource.

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    Message was edited by:
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