Check out the properties box for number2. It has many useful features such as setting send/receive signals (which is useful for hiding those control messages from the user, and eliminating wires). Also you can set the box to save its value, so when the patch is reloaded, you can easily preserve values. I use them like this, when I have a list of parameters that I wish to reuse on reloading the patch. I save my parameters with number2 boxes, and I give the number2 a receive signal of initialize (for example) and a send name like freq_h. Then, when I send a message "initialize bang;" all of the number2 boxes storing my parameters get sent to the proper calculations, using something like "r freq_h".
Chuck