Large: Increases volume, control. Small: Relieves fatigue, weakness. Deep: Darkens tone, especially in low register. Shallow: Brightens tone, improves response, especially in high register.
Large: Increases blowing freedom, volume, tone; sharpens high register (largest sizes also sharpen low register). Small: Increases resistance, endurance, brilliance; flattens high register.
Combinations of size and shape make the tone darker or brighter, raise or lower the pitch in one or more registers, increase or decrease volume. The backbore's effects depends in part also on the throat and cup.
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