== Params == The basic LV2 mechanism for controls is http://lv2plug.in/ns/lv2core#ControlPort[lv2:ControlPort], inherited from LADSPA. Control ports are problematic because they are not sample accurate, support only one type (`float`), and require that plugins poll to know when a control has changed. Parameters can be used instead to address these issues. Parameters can be thought of as properties of a plugin instance; they are identified by URI and have a value of any type. This deliberately meshes with the concept of plugin state defined by the http://lv2plug.in/ns/ext/state[LV2 state extension]. The state extension allows plugins to save and restore their parameters (along with other internal state information, if necessary). Parameters are accessed and manipulated using messages sent via a sequence port. The http://lv2plug.in/ns/ext/patch[LV2 patch extension] defines the standard messages for working with parameters. Typically, only two are used for simple plugins: http://lv2plug.in/ns/ext/patch#Set[patch:Set] sets a parameter to some value, and http://lv2plug.in/ns/ext/patch#Get[patch:Get] requests that the plugin send a description of its parameters.