a-comp: Add stereo version

5 files changed, 448 insertions, 61 deletions

diff --git a/libs/plugins/a-comp.lv2/a-comp#stereo.ttl.in b/libs/plugins/a-comp.lv2/a-comp#stereo.ttl.in
new file mode 100644
index 0000000000..438a87e1e1
--- /dev/null
+++ b/libs/plugins/a-comp.lv2/a-comp#stereo.ttl.in
@@ -0,0 +1,157 @@
+@prefix doap: <http://usefulinc.com/ns/doap#> .
+@prefix foaf: <http://xmlns.com/foaf/0.1/> .
+@prefix lv2:  <http://lv2plug.in/ns/lv2core#> .
+@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
+@prefix rsz:  <http://lv2plug.in/ns/ext/resize-port#> .
+@prefix ui:   <http://lv2plug.in/ns/extensions/ui#> .
+@prefix unit: <http://lv2plug.in/ns/extensions/units#> .
+
+<http://ardour.org/credits.html>
+	a foaf:Person ;
+	foaf:name "Ardour Team" ;
+	foaf:homepage <http://ardour.org/> .
+
+<urn:ardour:a-comp#stereo>
+    a lv2:Plugin, doap:Project, lv2:CompressorPlugin ;
+
+    lv2:optionalFeature <http://lv2plug.in/ns/lv2core#hardRTCapable>;
+
+    lv2:port [
+        a lv2:InputPort, lv2:ControlPort ;
+        lv2:index 0 ;
+        lv2:name "Attack" ;
+        lv2:symbol "att" ;
+        lv2:default 10.000000 ;
+        lv2:minimum 0.100000 ;
+        lv2:maximum 100.000000 ;
+        unit:unit unit:ms ;
+    ] ,
+    [
+        a lv2:InputPort, lv2:ControlPort ;
+        lv2:index 1 ;
+        lv2:name "Release" ;
+        lv2:symbol "rel" ;
+        lv2:default 80.000000 ;
+        lv2:minimum 1.000000 ;
+        lv2:maximum 500.000000 ;
+        unit:unit unit:ms ;
+    ] ,
+    [
+        a lv2:InputPort, lv2:ControlPort ;
+        lv2:index 2 ;
+        lv2:name "Knee" ;
+        lv2:symbol "kn" ;
+        lv2:default 0.000000 ;
+        lv2:minimum 0.000000 ;
+        lv2:maximum 8.000000 ;
+        unit:unit unit:db ;
+    ] ,
+    [
+        a lv2:InputPort, lv2:ControlPort ;
+        lv2:index 3 ;
+        lv2:name "Ratio" ;
+        lv2:symbol "rat" ;
+        lv2:default 4.000000 ;
+        lv2:minimum 1.000000 ;
+        lv2:maximum 20.000000 ;
+        unit:unit [
+            rdfs:label  " " ;
+            unit:symbol " " ;
+            unit:render "%f  " ;
+        ] ;
+    ] ,
+    [
+        a lv2:InputPort, lv2:ControlPort ;
+        lv2:index 4 ;
+        lv2:name "Threshold" ;
+        lv2:symbol "thr" ;
+        lv2:default 0.000000 ;
+        lv2:minimum -60.000000 ;
+        lv2:maximum 0.000000 ;
+        unit:unit unit:db ;
+    ] ,
+    [
+        a lv2:InputPort, lv2:ControlPort ;
+        lv2:index 5 ;
+        lv2:name "Makeup" ;
+        lv2:symbol "mak" ;
+        lv2:default 0.000000 ;
+        lv2:minimum 0.000000 ;
+        lv2:maximum 30.000000 ;
+        unit:unit unit:db ;
+    ] ,
+    [
+        a lv2:OutputPort, lv2:ControlPort ;
+        lv2:index 6 ;
+        lv2:name "Gain Reduction" ;
+        lv2:symbol "gr" ;
+        lv2:default 0.000000 ;
+        lv2:minimum 0.000000 ;
+        lv2:maximum 45.000000 ;
+        unit:unit unit:db ;
+    ] ,
+    [
+        a lv2:OutputPort, lv2:ControlPort ;
+        lv2:index 7 ;
+        lv2:name "Output Level" ;
+        lv2:symbol "outlevel" ;
+        lv2:default -45.000000 ;
+        lv2:minimum -45.000000 ;
+        lv2:maximum 0.000000 ;
+        unit:unit unit:db ;
+    ] ,
+    [
+        a lv2:InputPort, lv2:ControlPort ;
+        lv2:index 8 ;
+        lv2:name "Sidechain" ;
+        lv2:symbol "sidech" ;
+        lv2:default 0.000000 ;
+        lv2:minimum 0.000000 ;
+        lv2:maximum 1.000000 ;
+        lv2:portProperty lv2:toggled ;
+    ] ;
+
+    lv2:port [
+        a lv2:InputPort, lv2:AudioPort ;
+        lv2:index 9 ;
+        lv2:symbol "in_1" ;
+        lv2:name "Audio Input 1" ;
+    ] ,
+    [
+        a lv2:InputPort, lv2:AudioPort ;
+        lv2:index 10 ;
+        lv2:symbol "in_2" ;
+        lv2:name "Audio Input 2" ;
+    ] ,
+    [
+        a lv2:InputPort, lv2:AudioPort ;
+        lv2:index 11 ;
+        lv2:symbol "sidechain_in" ;
+        lv2:name "Sidechain Input" ;
+        lv2:portProperty lv2:isSideChain;
+    ],
+    [
+        a lv2:OutputPort, lv2:AudioPort ;
+        lv2:index 12 ;
+        lv2:symbol "out_1" ;
+        lv2:name "Audio Output 1" ;
+    ],
+    [
+        a lv2:OutputPort, lv2:AudioPort ;
+        lv2:index 13 ;
+        lv2:symbol "out_2" ;
+        lv2:name "Audio Output 2" ;
+    ] ;
+
+    rdfs:comment """
+A powerful stereo compressor.
+""" ;
+
+    doap:name "a-comp stereo" ;
+    doap:license "GPL v2+" ;
+    doap:maintainer <http://ardour.org/credits.html>
+
+#   ui:ui <urn:ardour:a-comp#ui>;
+
+    lv2:microVersion 1 ;
+    lv2:minorVersion 1 .
diff --git a/libs/plugins/a-comp.lv2/a-comp.c b/libs/plugins/a-comp.lv2/a-comp.c
index 6870b20c4e..9449c2741e 100644
--- a/libs/plugins/a-comp.lv2/a-comp.c
+++ b/libs/plugins/a-comp.lv2/a-comp.c
@@ -24,14 +24,11 @@
 
 #include "lv2/lv2plug.in/ns/lv2core/lv2.h"
 
-#define ACOMP_URI "urn:ardour:a-comp"
+#define ACOMP_URI		"urn:ardour:a-comp"
+#define ACOMP_STEREO_URI	"urn:ardour:a-comp#stereo"
 
 typedef enum {
-	ACOMP_INPUT0 = 0,
-	ACOMP_INPUT1,
-	ACOMP_OUTPUT,
-
-	ACOMP_ATTACK,
+	ACOMP_ATTACK = 0,
 	ACOMP_RELEASE,
 	ACOMP_KNEE,
 	ACOMP_RATIO,
@@ -41,14 +38,32 @@ typedef enum {
 	ACOMP_GAINR,
 	ACOMP_OUTLEVEL,
 	ACOMP_SIDECHAIN,
-} PortIndex;
 
+	ACOMP_INPUT,
+	ACOMP_SC,
+	ACOMP_OUTPUT,
+} PortIndexMono;
 
-typedef struct {
-	float* input0;
-	float* input1;
-	float* output;
+typedef enum {
+	ACOMP_STEREO_ATTACK = 0,
+	ACOMP_STEREO_RELEASE,
+	ACOMP_STEREO_KNEE,
+	ACOMP_STEREO_RATIO,
+	ACOMP_STEREO_THRESHOLD,
+	ACOMP_STEREO_MAKEUP,
+
+	ACOMP_STEREO_GAINR,
+	ACOMP_STEREO_OUTLEVEL,
+	ACOMP_STEREO_SIDECHAIN,
+
+	ACOMP_STEREO_INPUT0,
+	ACOMP_STEREO_INPUT1,
+	ACOMP_STEREO_SC,
+	ACOMP_STEREO_OUTPUT0,
+	ACOMP_STEREO_OUTPUT1,
+} PortIndexStereo;
 
+typedef struct {
 	float* attack;
 	float* release;
 	float* knee;
@@ -60,6 +75,12 @@ typedef struct {
 	float* outlevel;
 	float* sidechain;
 
+	float* input0;
+	float* input1;
+	float* sc;
+	float* output0;
+	float* output1;
+
 	float srate;
 	float old_yl;
 	float old_y1;
@@ -108,14 +129,15 @@ instantiate(const LV2_Descriptor* descriptor,
 	return (LV2_Handle)acomp;
 }
 
+
 static void
-connect_port(LV2_Handle instance,
+connect_port_mono(LV2_Handle instance,
              uint32_t port,
              void* data)
 {
 	AComp* acomp = (AComp*)instance;
 
-	switch ((PortIndex)port) {
+	switch ((PortIndexMono)port) {
 	case ACOMP_ATTACK:
 		acomp->attack = (float*)data;
 		break;
@@ -143,14 +165,67 @@ connect_port(LV2_Handle instance,
 	case ACOMP_SIDECHAIN:
 		acomp->sidechain = (float*)data;
 		break;
-	case ACOMP_INPUT0:
+	case ACOMP_INPUT:
 		acomp->input0 = (float*)data;
 		break;
-	case ACOMP_INPUT1:
-		acomp->input1 = (float*)data;
+	case ACOMP_SC:
+		acomp->sc = (float*)data;
 		break;
 	case ACOMP_OUTPUT:
-		acomp->output = (float*)data;
+		acomp->output0 = (float*)data;
+		break;
+	}
+}
+
+static void
+connect_port_stereo(LV2_Handle instance,
+             uint32_t port,
+             void* data)
+{
+	AComp* acomp = (AComp*)instance;
+
+	switch ((PortIndexStereo)port) {
+	case ACOMP_STEREO_ATTACK:
+		acomp->attack = (float*)data;
+		break;
+	case ACOMP_STEREO_RELEASE:
+		acomp->release = (float*)data;
+		break;
+	case ACOMP_STEREO_KNEE:
+		acomp->knee = (float*)data;
+		break;
+	case ACOMP_STEREO_RATIO:
+		acomp->ratio = (float*)data;
+		break;
+	case ACOMP_STEREO_THRESHOLD:
+		acomp->thresdb = (float*)data;
+		break;
+	case ACOMP_STEREO_MAKEUP:
+		acomp->makeup = (float*)data;
+		break;
+	case ACOMP_STEREO_GAINR:
+		acomp->gainr = (float*)data;
+		break;
+	case ACOMP_STEREO_OUTLEVEL:
+		acomp->outlevel = (float*)data;
+		break;
+	case ACOMP_STEREO_SIDECHAIN:
+		acomp->sidechain = (float*)data;
+		break;
+	case ACOMP_STEREO_INPUT0:
+		acomp->input0 = (float*)data;
+		break;
+	case ACOMP_STEREO_INPUT1:
+		acomp->input1 = (float*)data;
+		break;
+	case ACOMP_STEREO_SC:
+		acomp->sc = (float*)data;
+		break;
+	case ACOMP_STEREO_OUTPUT0:
+		acomp->output0 = (float*)data;
+		break;
+	case ACOMP_STEREO_OUTPUT1:
+		acomp->output1 = (float*)data;
 		break;
 	}
 }
@@ -185,13 +260,13 @@ activate(LV2_Handle instance)
 }
 
 static void
-run(LV2_Handle instance, uint32_t n_samples)
+run_mono(LV2_Handle instance, uint32_t n_samples)
 {
 	AComp* acomp = (AComp*)instance;
 
-	const float* const input0 = acomp->input0;
-	const float* const input1 = acomp->input1;
-	float* const output = acomp->output;
+	const float* const input = acomp->input0;
+	const float* const sc = acomp->sc;
+	float* const output = acomp->output0;
 
 	float srate = acomp->srate;
 	float width = (6.f * *(acomp->knee)) + 0.01;
@@ -207,7 +282,7 @@ run(LV2_Handle instance, uint32_t n_samples)
 	uint32_t i;
 	float ingain;
 	float in0;
-	float in1;
+	float sc0;
 	float ratio = *(acomp->ratio);
 	float thresdb = *(acomp->thresdb);
 
@@ -231,9 +306,9 @@ run(LV2_Handle instance, uint32_t n_samples)
 	float in_peak = 0;
 
 	for (i = 0; i < n_samples; i++) {
-		in0 = input0[i];
-		in1 = input1[i];
-		ingain = usesidechain ? in1 : in0;
+		in0 = input[i];
+		sc0 = sc[i];
+		ingain = usesidechain ? sc0 : in0;
 		Lyg = 0.f;
 		Lxg = (ingain==0.f) ? -160.f : to_dB(fabs(ingain));
 		Lxg = sanitize_denormal(Lxg);
@@ -296,6 +371,124 @@ run(LV2_Handle instance, uint32_t n_samples)
 }
 
 static void
+run_stereo(LV2_Handle instance, uint32_t n_samples)
+{
+	AComp* acomp = (AComp*)instance;
+
+	const float* const input0 = acomp->input0;
+	const float* const input1 = acomp->input1;
+	const float* const sc = acomp->sc;
+	float* const output0 = acomp->output0;
+	float* const output1 = acomp->output1;
+
+	float srate = acomp->srate;
+	float width = (6.f * *(acomp->knee)) + 0.01;
+	float cdb=0.f;
+	float attack_coeff = exp(-1000.f/(*(acomp->attack) * srate));
+	float release_coeff = exp(-1000.f/(*(acomp->release) * srate));
+
+	float max = 0.f;
+	float lgaininp = 0.f;
+	float rgaininp = 0.f;
+	float Lgain = 1.f;
+	float Lxg, Lxl, Lyg, Lyl, Ly1;
+	int usesidechain = (*(acomp->sidechain) < 0.5) ? 0 : 1;
+	uint32_t i;
+	float ingain;
+	float in0;
+	float in1;
+	float sc0;
+	float ratio = *(acomp->ratio);
+	float thresdb = *(acomp->thresdb);
+
+#ifdef LV2_EXTENDED
+	if (acomp->v_knee != *acomp->knee) {
+		acomp->v_knee = *acomp->knee;
+		acomp->need_expose = true;
+	}
+
+	if (acomp->v_ratio != *acomp->ratio) {
+		acomp->v_ratio = *acomp->ratio;
+		acomp->need_expose = true;
+	}
+
+	if (acomp->v_thresdb != *acomp->thresdb) {
+		acomp->v_thresdb = *acomp->thresdb;
+		acomp->need_expose = true;
+	}
+#endif
+
+	float in_peak = 0;
+
+	for (i = 0; i < n_samples; i++) {
+		in0 = input0[i];
+		in1 = input1[i];
+		sc0 = sc[i];
+		ingain = usesidechain ? fabs(sc0) : fmaxf(fabs(in0), fabs(in1));
+		Lyg = 0.f;
+		Lxg = (ingain==0.f) ? -160.f : to_dB(ingain);
+		Lxg = sanitize_denormal(Lxg);
+
+		Lyg = Lxg + (1.f/ratio-1.f)*(Lxg-thresdb+width/2.f)*(Lxg-thresdb+width/2.f)/(2.f*width);
+
+		if (2.f*(Lxg-thresdb) < -width) {
+			Lyg = Lxg;
+		} else {
+			Lyg = thresdb + (Lxg-thresdb)/ratio;
+			Lyg = sanitize_denormal(Lyg);
+		}
+
+		Lxl = Lxg - Lyg;
+
+		acomp->old_y1 = sanitize_denormal(acomp->old_y1);
+		acomp->old_yl = sanitize_denormal(acomp->old_yl);
+		Ly1 = fmaxf(Lxl, release_coeff * acomp->old_y1+(1.f-release_coeff)*Lxl);
+		Lyl = attack_coeff * acomp->old_yl+(1.f-attack_coeff)*Ly1;
+		Ly1 = sanitize_denormal(Ly1);
+		Lyl = sanitize_denormal(Lyl);
+
+		cdb = -Lyl;
+		Lgain = from_dB(cdb);
+
+		*(acomp->gainr) = Lyl;
+
+		if (ingain > in_peak) {
+			in_peak = ingain;
+		}
+		lgaininp = in0 * Lgain;
+		rgaininp = in1 * Lgain;
+		output0[i] = lgaininp * from_dB(*(acomp->makeup));
+		output1[i] = rgaininp * from_dB(*(acomp->makeup));
+
+		max = (fmaxf(fabsf(output0[i]), fabsf(output1[i])) > max) ? fmaxf(fabsf(output0[i]), fabsf(output1[i])) : sanitize_denormal(max);
+
+		// TODO re-use local variables on stack
+		// store values back to acomp at the end of the inner-loop
+		acomp->old_yl = Lyl;
+		acomp->old_y1 = Ly1;
+		acomp->old_yg = Lyg;
+	}
+
+	*(acomp->outlevel) = (max < 0.0056f) ? -45.f : to_dB(max);
+
+#ifdef LV2_EXTENDED
+	acomp->v_lvl += .1 * (in_peak - acomp->v_lvl);  // crude LPF TODO use n_samples/rate TC
+	const float v_lvl_in = (acomp->v_lvl < 0.001f) ? -60.f : to_dB(acomp->v_lvl);
+	const float v_lvl_out = (max < 0.001f) ? -60.f : to_dB(max);
+	if (fabsf (acomp->v_lvl_out - v_lvl_out) >= 1 || fabsf (acomp->v_lvl_in - v_lvl_in) >= 1) {
+		// >= 1dB difference
+		acomp->need_expose = true;
+		acomp->v_lvl_in = v_lvl_in;
+		acomp->v_lvl_out = v_lvl_out - *acomp->makeup;
+	}
+	if (acomp->need_expose && acomp->queue_draw) {
+		acomp->need_expose = false;
+		acomp->queue_draw->queue_draw (acomp->queue_draw->handle);
+	}
+#endif
+}
+
+static void
 deactivate(LV2_Handle instance)
 {
 	activate(instance);
@@ -464,12 +657,23 @@ extension_data(const char* uri)
 	return NULL;
 }
 
-static const LV2_Descriptor descriptor = {
+static const LV2_Descriptor descriptor_mono = {
 	ACOMP_URI,
 	instantiate,
-	connect_port,
+	connect_port_mono,
+	activate,
+	run_mono,
+	deactivate,
+	cleanup,
+	extension_data
+};
+
+static const LV2_Descriptor descriptor_stereo = {
+	ACOMP_STEREO_URI,
+	instantiate,
+	connect_port_stereo,
 	activate,
-	run,
+	run_stereo,
 	deactivate,
 	cleanup,
 	extension_data
@@ -481,7 +685,9 @@ lv2_descriptor(uint32_t index)
 {
 	switch (index) {
 	case 0:
-		return &descriptor;
+		return &descriptor_mono;
+	case 1:
+		return &descriptor_stereo;
 	default:
 		return NULL;
 	}
diff --git a/libs/plugins/a-comp.lv2/a-comp.ttl.in b/libs/plugins/a-comp.lv2/a-comp.ttl.in
index 703cb25572..fed9d87307 100644
--- a/libs/plugins/a-comp.lv2/a-comp.ttl.in
+++ b/libs/plugins/a-comp.lv2/a-comp.ttl.in
@@ -17,29 +17,8 @@
     lv2:optionalFeature <http://lv2plug.in/ns/lv2core#hardRTCapable>;
 
     lv2:port [
-        a lv2:InputPort, lv2:AudioPort ;
-        lv2:index 0 ;
-        lv2:symbol "lv2_audio_in_1" ;
-        lv2:name "Audio Input 1" ;
-    ] ,
-    [
-        a lv2:InputPort, lv2:AudioPort ;
-        lv2:index 1 ;
-        lv2:symbol "lv2_sidechain_in" ;
-        lv2:name "Sidechain Input" ;
-        lv2:portProperty lv2:isSideChain;
-    ] ;
-
-    lv2:port [
-        a lv2:OutputPort, lv2:AudioPort ;
-        lv2:index 2 ;
-        lv2:symbol "lv2_audio_out_1" ;
-        lv2:name "Audio Output 1" ;
-    ] ;
-
-    lv2:port [
         a lv2:InputPort, lv2:ControlPort ;
-        lv2:index 3 ;
+        lv2:index 0 ;
         lv2:name "Attack" ;
         lv2:symbol "att" ;
         lv2:default 10.000000 ;
@@ -49,7 +28,7 @@
     ] ,
     [
         a lv2:InputPort, lv2:ControlPort ;
-        lv2:index 4 ;
+        lv2:index 1 ;
         lv2:name "Release" ;
         lv2:symbol "rel" ;
         lv2:default 80.000000 ;
@@ -59,7 +38,7 @@
     ] ,
     [
         a lv2:InputPort, lv2:ControlPort ;
-        lv2:index 5 ;
+        lv2:index 2 ;
         lv2:name "Knee" ;
         lv2:symbol "kn" ;
         lv2:default 0.000000 ;
@@ -69,7 +48,7 @@
     ] ,
     [
         a lv2:InputPort, lv2:ControlPort ;
-        lv2:index 6 ;
+        lv2:index 3 ;
         lv2:name "Ratio" ;
         lv2:symbol "rat" ;
         lv2:default 4.000000 ;
@@ -83,7 +62,7 @@
     ] ,
     [
         a lv2:InputPort, lv2:ControlPort ;
-        lv2:index 7 ;
+        lv2:index 4 ;
         lv2:name "Threshold" ;
         lv2:symbol "thr" ;
         lv2:default 0.000000 ;
@@ -93,7 +72,7 @@
     ] ,
     [
         a lv2:InputPort, lv2:ControlPort ;
-        lv2:index 8 ;
+        lv2:index 5 ;
         lv2:name "Makeup" ;
         lv2:symbol "mak" ;
         lv2:default 0.000000 ;
@@ -103,7 +82,7 @@
     ] ,
     [
         a lv2:OutputPort, lv2:ControlPort ;
-        lv2:index 9 ;
+        lv2:index 6 ;
         lv2:name "Gain Reduction" ;
         lv2:symbol "gr" ;
         lv2:default 0.000000 ;
@@ -113,7 +92,7 @@
     ] ,
     [
         a lv2:OutputPort, lv2:ControlPort ;
-        lv2:index 10 ;
+        lv2:index 7 ;
         lv2:name "Output Level" ;
         lv2:symbol "outlevel" ;
         lv2:default -45.000000 ;
@@ -123,7 +102,7 @@
     ] ,
     [
         a lv2:InputPort, lv2:ControlPort ;
-        lv2:index 11 ;
+        lv2:index 8 ;
         lv2:name "Sidechain" ;
         lv2:symbol "sidech" ;
         lv2:default 0.000000 ;
@@ -132,6 +111,26 @@
         lv2:portProperty lv2:toggled ;
     ] ;
 
+    lv2:port [
+        a lv2:InputPort, lv2:AudioPort ;
+        lv2:index 9 ;
+        lv2:symbol "lv2_audio_in_1" ;
+        lv2:name "Audio Input 1" ;
+    ] ,
+    [
+        a lv2:InputPort, lv2:AudioPort ;
+        lv2:index 10 ;
+        lv2:symbol "lv2_sidechain_in" ;
+        lv2:name "Sidechain Input" ;
+        lv2:portProperty lv2:isSideChain;
+    ],
+    [
+        a lv2:OutputPort, lv2:AudioPort ;
+        lv2:index 11 ;
+        lv2:symbol "lv2_audio_out_1" ;
+        lv2:name "Audio Output 1" ;
+    ] ;
+
     rdfs:comment """
 A powerful mono compressor.
 """ ;
@@ -142,5 +141,5 @@ A powerful mono compressor.
 
 #   ui:ui <urn:ardour:a-comp#ui>;
 
-    lv2:microVersion 0 ;
+    lv2:microVersion 1 ;
     lv2:minorVersion 1 .
diff --git a/libs/plugins/a-comp.lv2/manifest.ttl.in b/libs/plugins/a-comp.lv2/manifest.ttl.in
index 73cacd4dbf..de71199617 100644
--- a/libs/plugins/a-comp.lv2/manifest.ttl.in
+++ b/libs/plugins/a-comp.lv2/manifest.ttl.in
@@ -8,6 +8,11 @@
     lv2:binary <a-comp@LIB_EXT@> ;
     rdfs:seeAlso <a-comp.ttl> .
 
+<urn:ardour:a-comp#stereo>
+    a lv2:Plugin ;
+    lv2:binary <a-comp@LIB_EXT@> ;
+    rdfs:seeAlso <a-comp#stereo.ttl> .
+
 #<urn:ardour:a-comp#ui>
 #    a ui:GtkUI ;
 #    ui:binary <a-comp-ui@LIB_EXT@> ;
@@ -30,3 +35,23 @@
     lv2:appliesTo <urn:ardour:a-comp> ;
     rdfs:label "VocalLeveller" ;
     rdfs:seeAlso <presets.ttl> .
+
+
+
+<urn:ardour:a-comp#preset001>
+    a pset:Preset ;
+    lv2:appliesTo <urn:ardour:a-comp#stereo> ;
+    rdfs:label "Zero" ;
+    rdfs:seeAlso <presets.ttl> .
+
+<urn:ardour:a-comp#preset002>
+    a pset:Preset ;
+    lv2:appliesTo <urn:ardour:a-comp#stereo> ;
+    rdfs:label "PoppySnare" ;
+    rdfs:seeAlso <presets.ttl> .
+
+<urn:ardour:a-comp#preset003>
+    a pset:Preset ;
+    lv2:appliesTo <urn:ardour:a-comp#stereo> ;
+    rdfs:label "VocalLeveller" ;
+    rdfs:seeAlso <presets.ttl> .
diff --git a/libs/plugins/a-comp.lv2/wscript b/libs/plugins/a-comp.lv2/wscript
index 9d33d16507..4c8cdc1434 100644
--- a/libs/plugins/a-comp.lv2/wscript
+++ b/libs/plugins/a-comp.lv2/wscript
@@ -26,7 +26,7 @@ def build(bld):
 
     if bld.is_defined ('HAVE_LV2'):
         # Build RDF files
-        for i in ['manifest.ttl', 'a-comp.ttl', 'presets.ttl']:
+        for i in ['manifest.ttl', 'a-comp.ttl', 'a-comp#stereo.ttl', 'presets.ttl']:
             bld(features     = 'subst',
                 source       = i + '.in',
                 target       = '../../LV2/%s/%s' % (bundle, i),