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+@prefix atom: <http://lv2plug.in/ns/ext/atom#> .
+@prefix lv2: <http://lv2plug.in/ns/lv2core#> .
+@prefix owl: <http://www.w3.org/2002/07/owl#> .
+@prefix param: <http://lv2plug.in/ns/ext/parameters#> .
+@prefix pg: <http://lv2plug.in/ns/ext/port-groups#> .
+@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
+@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
+@prefix units: <http://lv2plug.in/ns/extensions/units#> .
+
+<http://lv2plug.in/ns/ext/parameters>
+ a owl:Ontology ;
+ rdfs:label "LV2 Parameters" ;
+ rdfs:comment "Common parameters for audio processing." ;
+ rdfs:seeAlso <parameters.meta.ttl> ;
+ owl:imports <http://lv2plug.in/ns/ext/atom> ,
+ <http://lv2plug.in/ns/ext/port-groups> ,
+ <http://lv2plug.in/ns/lv2core> .
+
+param:ControlGroup
+ a rdfs:Class ;
+ rdfs:subClassOf pg:Group ;
+ rdfs:label "Control Group" ;
+ rdfs:comment "A group representing a set of associated controls." .
+
+param:amplitude
+ a lv2:Parameter ;
+ rdfs:range atom:Float ;
+ rdfs:label "amplitude" ;
+ rdfs:comment "An amplitude as a factor, where 0 is silent and 1 is unity." .
+
+param:attack
+ a lv2:Parameter ;
+ rdfs:range atom:Float ;
+ rdfs:label "attack" ;
+ rdfs:comment "The duration of an envelope attack stage." .
+
+param:cutoffFrequency
+ a lv2:Parameter ;
+ rdfs:range atom:Float ;
+ rdfs:label "cutoff frequency" ;
+ rdfs:comment "The cutoff frequency, typically in Hz, for a filter." .
+
+param:decay
+ a lv2:Parameter ;
+ rdfs:range atom:Float ;
+ rdfs:label "decay" ;
+ rdfs:comment "The duration of an envelope decay stage." .
+
+param:delay
+ a lv2:Parameter ;
+ rdfs:range atom:Float ;
+ rdfs:label "delay" ;
+ rdfs:comment "The duration of an envelope delay stage." .
+
+param:frequency
+ a lv2:Parameter ;
+ rdfs:range atom:Float ;
+ rdfs:label "frequency" ;
+ rdfs:comment "A frequency, typically in Hz." .
+
+param:hold
+ a lv2:Parameter ;
+ rdfs:range atom:Float ;
+ rdfs:label "hold" ;
+ rdfs:comment "The duration of an envelope hold stage." .
+
+param:pulseWidth
+ a lv2:Parameter ;
+ rdfs:range atom:Float ;
+ rdfs:label "pulse width" ;
+ rdfs:comment "The width of a pulse of a rectangular waveform." .
+
+param:ratio
+ a lv2:Parameter ;
+ rdfs:range atom:Float ;
+ rdfs:label "ratio" ;
+ rdfs:comment "Compression ratio." .
+
+param:release
+ a lv2:Parameter ;
+ rdfs:range atom:Float ;
+ rdfs:label "release" ;
+ rdfs:comment "The duration of an envelope release stage." .
+
+param:resonance
+ a lv2:Parameter ;
+ rdfs:range atom:Float ;
+ rdfs:label "resonance" ;
+ rdfs:comment "The resonance of a filter." .
+
+param:sustain
+ a lv2:Parameter ;
+ rdfs:label "sustain" ;
+ rdfs:range atom:Float ;
+ rdfs:comment "The level of an envelope sustain stage as a factor." .
+
+param:threshold
+ a lv2:Parameter ;
+ rdfs:range atom:Float ;
+ rdfs:label "threshold" ;
+ rdfs:comment "Compression threshold." .
+
+param:waveform
+ a lv2:Parameter ;
+ rdfs:range atom:Float ;
+ rdfs:label "waveform" ;
+ rdfs:comment """The waveform "fader" for oscillators or modulators that have several.""" .
+
+param:gain
+ a lv2:Parameter ;
+ rdfs:range atom:Float ;
+ lv2:default 0.0 ;
+ lv2:minimum -20.0 ;
+ lv2:maximum 20.0 ;
+ units:unit units:db ;
+ rdfs:label "gain" ;
+ rdfs:comment "Gain in decibels." .
+
+param:wetDryRatio
+ a lv2:Parameter ;
+ rdfs:label "wet/dry ratio" ;
+ rdfs:comment "The ratio between processed and bypassed levels in the output." .
+
+param:wetLevel
+ a lv2:Parameter ;
+ rdfs:label "wet level" ;
+ rdfs:comment "The level of the processed component of a signal." .
+
+param:dryLevel
+ a lv2:Parameter ;
+ rdfs:label "dry level" ;
+ rdfs:comment "The level of the unprocessed component of a signal." .
+
+param:bypass
+ a lv2:Parameter ;
+ rdfs:label "bypass" ;
+ rdfs:comment "A boolean parameter that disables processing if true." .
+
+param:sampleRate
+ a lv2:Parameter ;
+ rdfs:label "sample rate" ;
+ rdfs:comment "A sample rate in Hz." .
+
+param:EnvelopeControls
+ a rdfs:Class ;
+ rdfs:subClassOf param:ControlGroup ;
+ rdfs:label "Envelope Controls" ;
+ rdfs:comment "Typical controls for a DAHDSR envelope." ;
+ pg:element [
+ lv2:index 0 ;
+ lv2:designation param:delay
+ ] , [
+ lv2:index 1 ;
+ lv2:designation param:attack
+ ] , [
+ lv2:index 2 ;
+ lv2:designation param:hold
+ ] , [
+ lv2:index 3 ;
+ lv2:designation param:decay
+ ] , [
+ lv2:index 4 ;
+ lv2:designation param:sustain
+ ] , [
+ lv2:index 5 ;
+ lv2:designation param:release
+ ] .
+
+param:OscillatorControls
+ a rdfs:Class ;
+ rdfs:subClassOf param:ControlGroup ;
+ rdfs:label "Oscillator Controls" ;
+ rdfs:comment "Typical controls for an oscillator." ;
+ pg:element [
+ lv2:designation param:frequency
+ ] , [
+ lv2:designation param:amplitude
+ ] , [
+ lv2:designation param:waveform
+ ] , [
+ lv2:designation param:pulseWidth
+ ] .
+
+param:FilterControls
+ a rdfs:Class ;
+ rdfs:subClassOf param:ControlGroup ;
+ rdfs:label "Filter Controls" ;
+ rdfs:comment "Typical controls for a filter." ;
+ pg:element [
+ lv2:designation param:cutoffFrequency
+ ] , [
+ lv2:designation param:resonance
+ ] .
+
+param:CompressorControls
+ a rdfs:Class ;
+ rdfs:subClassOf param:ControlGroup ;
+ rdfs:label "Compressor Controls" ;
+ rdfs:comment "Typical controls for a compressor." ;
+ pg:element [
+ lv2:designation param:threshold
+ ] , [
+ lv2:designation param:ratio
+ ] .
+