diff --git a/spa/include/spa/param/props.h b/spa/include/spa/param/props.h
index e7d8b2693..0546f7caa 100644
--- a/spa/include/spa/param/props.h
+++ b/spa/include/spa/param/props.h
@@ -81,6 +81,9 @@ enum spa_prop {
 	SPA_PROP_volumeStep,			/**< a volume step (Float) */
 	SPA_PROP_channelMap,			/**< a channelmap array
 						  * (Array (Id enum spa_audio_channel)) */
+	SPA_PROP_monitorMute,			/**< mute (Bool) */
+	SPA_PROP_monitorVolumes,		/**< a volume array, one volume per
+						  *  channel (Array of Float) */
 
 	SPA_PROP_START_Video	= 0x20000,	/**< video related properties */
 	SPA_PROP_brightness,
diff --git a/spa/include/spa/param/type-info.h b/spa/include/spa/param/type-info.h
index ea726362c..79717b986 100644
--- a/spa/include/spa/param/type-info.h
+++ b/spa/include/spa/param/type-info.h
@@ -77,6 +77,11 @@ static const struct spa_type_info spa_type_prop_channel_map[] = {
 	{ 0, 0, NULL, NULL },
 };
 
+static const struct spa_type_info spa_type_prop_monitor_volume[] = {
+	{ SPA_PROP_START, SPA_TYPE_Float, SPA_TYPE_INFO_BASE "monitorVolumes", NULL, },
+	{ 0, 0, NULL, NULL },
+};
+
 static const struct spa_type_info spa_type_props[] = {
 	{ SPA_PROP_START, SPA_TYPE_Id, SPA_TYPE_INFO_PROPS_BASE, spa_type_param, },
 	{ SPA_PROP_unknown, SPA_TYPE_None, SPA_TYPE_INFO_PROPS_BASE "unknown", NULL },
@@ -105,6 +110,8 @@ static const struct spa_type_info spa_type_props[] = {
 	{ SPA_PROP_volumeBase, SPA_TYPE_Float, SPA_TYPE_INFO_PROPS_BASE "volumeBase", NULL },
 	{ SPA_PROP_volumeStep, SPA_TYPE_Float, SPA_TYPE_INFO_PROPS_BASE "volumeStep", NULL },
 	{ SPA_PROP_channelMap, SPA_TYPE_Array, SPA_TYPE_INFO_PROPS_BASE "channelMap", spa_type_prop_channel_map },
+	{ SPA_PROP_monitorMute, SPA_TYPE_Bool, SPA_TYPE_INFO_PROPS_BASE "monitorMute", NULL },
+	{ SPA_PROP_monitorVolumes, SPA_TYPE_Array, SPA_TYPE_INFO_PROPS_BASE "monitorVolumes", spa_type_prop_monitor_volume },
 
 	{ SPA_PROP_brightness, SPA_TYPE_Int, SPA_TYPE_INFO_PROPS_BASE "brightness", NULL },
 	{ SPA_PROP_contrast, SPA_TYPE_Int, SPA_TYPE_INFO_PROPS_BASE "contrast", NULL },