This extension defines Control Voltage (CV) ports, which are audio-rate control ports like those used on classical voltage-controlled synthesizers. These ports serve as control ports like lv2:ControlPort but can also be used for audio-rate modulation of control signals. This enables many types of processing and synthesis which are not possible with a lower control rate.
Ports of this type have identical semantics to lv2:AudioPort in terms of buffer format and connection/input/output logistics. However, rather than the buffer representing audio, the buffer represents audio-rate control data. A CVPort SHOULD have the same properties a lv2:ControlPort typically has to describe appropriate control values (e.g. lv2:minimum, lv2:maximum, lv2:default) Hosts SHOULD take care to prevent data from a CVPort port from being used as audio except in cases where this is known to be safe. Example: <http://example.org/some-plugin> lv2:port [ a cv:CVPort, lv2:InputPort ; lv2:index 0 ; lv2:minimum -1.0 ; lv2:maximum 1.0 ; lv2:default 0.0 ; lv2:symbol "modulation" ; lv2:name "Modulation" ; ] .