diff --git a/templates/api/src/plugin_api.h b/templates/api/src/plugin_api.h
index 3e2e7c9..a193234 100644
--- a/templates/api/src/plugin_api.h
+++ b/templates/api/src/plugin_api.h
@@ -46,9 +46,9 @@ typedef struct {
 	const char * (*get_bindir)(void *handle);
 	const char * (*get_datadir)(void *handle);
 {{?it.product.parameters.find(x => x.direction == "input")}}
-	void (*set_parameter_begin)(void *handle, size_t index);
+	void (*set_parameter_begin)(void *handle, size_t index, float value);
 	void (*set_parameter)(void *handle, size_t index, float value);
-	void (*set_parameter_end)(void *handle, size_t index);
+	void (*set_parameter_end)(void *handle, size_t index, float value);
 {{?}}
 } plugin_ui_callbacks;
 
diff --git a/templates/lv2-next/src/lv2.c b/templates/lv2-next/src/lv2.c
index 39fd934..4734804 100644
--- a/templates/lv2-next/src/lv2.c
+++ b/templates/lv2-next/src/lv2.c
@@ -348,11 +348,13 @@ static const char * ui_get_bundle_path_cb(void *handle) {
 }
 
 # if DATA_PRODUCT_CONTROL_INPUTS_N > 0
-static void ui_set_parameter_begin_cb(void *handle, size_t index) {
+static void ui_set_parameter_begin_cb(void *handle, size_t index, float value) {
 	ui_instance *instance = (ui_instance *)handle;
 	if (instance->has_touch) {
 		index = index_to_param[index];
 		instance->touch.touch(instance->touch.handle, index, true);
+		value = adjust_param(index - CONTROL_INPUT_INDEX_OFFSET, value);
+		instance->write(instance->controller, index, sizeof(float), 0, &value);
 	}
 }
 
@@ -363,10 +365,12 @@ static void ui_set_parameter_cb(void *handle, size_t index, float value) {
 	instance->write(instance->controller, index, sizeof(float), 0, &value);
 }
 
-static void ui_set_parameter_end_cb(void *handle, size_t index) {
+static void ui_set_parameter_end_cb(void *handle, size_t index, float value) {
 	ui_instance *instance = (ui_instance *)handle;
 	if (instance->has_touch) {
 		index = index_to_param[index];
+		value = adjust_param(index - CONTROL_INPUT_INDEX_OFFSET, value);
+		instance->write(instance->controller, index, sizeof(float), 0, &value);
 		instance->touch.touch(instance->touch.handle, index, false);
 	}
 }
diff --git a/templates/lv2/src/lv2.c b/templates/lv2/src/lv2.c
index 4d53a6c..2d189f7 100644
--- a/templates/lv2/src/lv2.c
+++ b/templates/lv2/src/lv2.c
@@ -527,11 +527,13 @@ static const char * ui_get_bundle_path_cb(void *handle) {
 }
 
 # if DATA_PRODUCT_CONTROL_INPUTS_N > 0
-static void ui_set_parameter_begin_cb(void *handle, size_t index) {
+static void ui_set_parameter_begin_cb(void *handle, size_t index, float value) {
 	ui_instance *instance = (ui_instance *)handle;
 	if (instance->has_touch) {
 		index = index_to_param[index];
 		instance->touch.touch(instance->touch.handle, index, true);
+		value = adjust_param(index - CONTROL_INPUT_INDEX_OFFSET, value);
+		instance->write(instance->controller, index, sizeof(float), 0, &value);
 	}
 }
 
@@ -542,10 +544,12 @@ static void ui_set_parameter_cb(void *handle, size_t index, float value) {
 	instance->write(instance->controller, index, sizeof(float), 0, &value);
 }
 
-static void ui_set_parameter_end_cb(void *handle, size_t index) {
+static void ui_set_parameter_end_cb(void *handle, size_t index, float value) {
 	ui_instance *instance = (ui_instance *)handle;
 	if (instance->has_touch) {
 		index = index_to_param[index];
+		value = adjust_param(index - CONTROL_INPUT_INDEX_OFFSET, value);
+		instance->write(instance->controller, index, sizeof(float), 0, &value);
 		instance->touch.touch(instance->touch.handle, index, false);
 	}
 }
diff --git a/templates/vst3/src/vst3.c b/templates/vst3/src/vst3.c
index 36a046a..8331734 100644
--- a/templates/vst3/src/vst3.c
+++ b/templates/vst3/src/vst3.c
@@ -1397,7 +1397,7 @@ static void plugViewUpdateAllParameters(plugView *view) {
 #  endif
 }
 
-static void plugViewSetParameterBeginCb(void *handle, size_t index) {
+static void plugViewSetParameterBeginCb(void *handle, size_t index, float value) {
 	TRACE("set parameter begin cb\n");
 
 #  ifdef DATA_PARAM_LATENCY_INDEX
@@ -1406,7 +1406,12 @@ static void plugViewSetParameterBeginCb(void *handle, size_t index) {
 	index = index >= DATA_PARAM_LATENCY_INDEX ? index - 1 : index;
 #  endif
 	plugView *v = (plugView *)handle;
+	ParameterData *p;
+	double *pv;
+	controllerGetParamDataValuePtrs(v->ctrl, index, &p, &pv);
+	*pv = parameterAdjust(p, value); // let Reaper find the updated value
 	v->ctrl->componentHandler->lpVtbl->beginEdit(v->ctrl->componentHandler, parameterInfo[index].id);
+	v->ctrl->componentHandler->lpVtbl->performEdit(v->ctrl->componentHandler, parameterInfo[index].id, parameterUnmap(p, *pv));
 }
 
 static void plugViewSetParameterCb(void *handle, size_t index, float value) {
@@ -1426,7 +1431,7 @@ static void plugViewSetParameterCb(void *handle, size_t index, float value) {
 	v->ctrl->componentHandler->lpVtbl->performEdit(v->ctrl->componentHandler, parameterInfo[index].id, parameterUnmap(p, *pv));
 }
 
-static void plugViewSetParameterEndCb(void *handle, size_t index) {
+static void plugViewSetParameterEndCb(void *handle, size_t index, float value) {
 	TRACE("set parameter end cb\n");
 
 #  ifdef DATA_PARAM_LATENCY_INDEX
@@ -1435,6 +1440,11 @@ static void plugViewSetParameterEndCb(void *handle, size_t index) {
 	index = index >= DATA_PARAM_LATENCY_INDEX ? index - 1 : index;
 #  endif
 	plugView *v = (plugView *)handle;
+	ParameterData *p;
+	double *pv;
+	controllerGetParamDataValuePtrs(v->ctrl, index, &p, &pv);
+	*pv = parameterAdjust(p, value); // let Reaper find the updated value
+	v->ctrl->componentHandler->lpVtbl->performEdit(v->ctrl->componentHandler, parameterInfo[index].id, parameterUnmap(p, *pv));
 	v->ctrl->componentHandler->lpVtbl->endEdit(v->ctrl->componentHandler, parameterInfo[index].id);
 }
 
diff --git a/test/plugin_ui.h b/test/plugin_ui.h
index c81ef5e..7d72612 100644
--- a/test/plugin_ui.h
+++ b/test/plugin_ui.h
@@ -159,22 +159,19 @@ static PuglStatus plugin_ui_on_event(PuglView *view, const PuglEvent *event) {
 			    && ev->y >= y + 0.15 * h && ev->y <= y + 0.25 * h) {
 				instance->param_down = 0;
 				instance->gain = (float)((ev->x - (x + 0.1 * w)) / (0.8 * w));
-				instance->cbs.set_parameter_begin(instance->cbs.handle, 0);
-				instance->cbs.set_parameter(instance->cbs.handle, 0, -60.f + 80.f * instance->gain);
+				instance->cbs.set_parameter_begin(instance->cbs.handle, 0, -60.f + 80.f * instance->gain);
 				puglPostRedisplay(instance->view);
 			} else if (ev->x >= x + 0.1 * w && ev->x <= x + 0.9 * w
 			    && ev->y >= y + 0.3 * h && ev->y <= y + 0.4 * h) {
 				instance->param_down = 1;
 				instance->delay = (float)((ev->x - (x + 0.1 * w)) / (0.8 * w));
-				instance->cbs.set_parameter_begin(instance->cbs.handle, 1);
-				instance->cbs.set_parameter(instance->cbs.handle, 1, 1000.f * instance->delay);
+				instance->cbs.set_parameter_begin(instance->cbs.handle, 1, 1000.f * instance->delay);
 				puglPostRedisplay(instance->view);
 			} else if (ev->x >= x + 0.1 * w && ev->x <= x + 0.9 * w
 			    && ev->y >= y + 0.45 * h && ev->y <= y + 0.55 * h) {
 				instance->param_down = 2;
 				instance->cutoff = (float)((ev->x - (x + 0.1 * w)) / (0.8 * w));
-				instance->cbs.set_parameter_begin(instance->cbs.handle, 2);
-				instance->cbs.set_parameter(instance->cbs.handle, 2, (632.4555320336746f * instance->cutoff + 20.653108640674372f) / (1.0326554320337158f - instance->cutoff));
+				instance->cbs.set_parameter_begin(instance->cbs.handle, 2, (632.4555320336746f * instance->cutoff + 20.653108640674372f) / (1.0326554320337158f - instance->cutoff));
 				puglPostRedisplay(instance->view);
 			} else if (ev->x >= x + 0.4 * w && ev->x <= x + 0.6 * w
 			    && ev->y >= y + 0.6 * h && ev->y <= y + 0.7 * h) {
@@ -227,7 +224,24 @@ static PuglStatus plugin_ui_on_event(PuglView *view, const PuglEvent *event) {
 				}
 
 			if (instance->param_down != -1) {
-				instance->cbs.set_parameter_end(instance->cbs.handle, instance->param_down);
+				float v = ev->x < x + 0.1 * w ? 0.f : (ev->x > x + 0.9 * w ? 1.f : (float)((ev->x - (x + 0.1 * w)) / (0.8 * w)));
+				switch (instance->param_down) {
+				case 0:
+					instance->gain = v;
+					instance->cbs.set_parameter_end(instance->cbs.handle, 0, -60.f + 80.f * instance->gain);
+					puglPostRedisplay(instance->view);
+					break;
+				case 1:
+					instance->delay = v;
+					instance->cbs.set_parameter_end(instance->cbs.handle, 1, 1000.f * instance->delay);
+					puglPostRedisplay(instance->view);
+					break;
+				case 2:
+					instance->cutoff = v;
+					instance->cbs.set_parameter_end(instance->cbs.handle, 2, (632.4555320336746f * instance->cutoff + 20.653108640674372f) / (1.0326554320337158f - instance->cutoff));
+					puglPostRedisplay(instance->view);
+					break;
+				}
 				instance->param_down = -1;
 			}
 		}