On the Sentry Xpress controller, why would you use a second segment, and what's the purpose of the speeds?
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The extra segments in PRO1 - PRO4 are for more complicated firings. You may never need more than one segment, however. In fact there is a tendency to use too many segments, especially with small projects.
If you were firing a thick glass project into a mold, you would need an extra segment for cooling through the annealing range. Otherwise the glass would crack, because it would cool too fast.
Any time you want to change the firing speed or add an extra hold somewhere in the firing, you will need an extra segment. For instance, crystalline ceramic glazes need several segments.
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