The [[RF.Spice A/D]] Device Manager is a separate application you can use for defining or importing new parts or modifying those already in the parts bin. You will often find [[RF.Spice]]'s large parts database adequate for most practical circuits. However, you can customize and expand the database to meet your growing analysis and design needs. The Device Manager has an integrated Symbol Editor with an array of drawing tools, which you can use to create new device symbols or modify the existing ones.
== Choosing From Two Simulation Modes ==
In [[RF.Spice A/D]], you can choose two distinct simulation modes: interactive "Live Simulations" and non-interactive "Predefined [[Tests]]". There are important differences between a test and a live simulation that must be understood before you can use [[RF.Spice A/D]] effectively.