diff --git a/apmaster.json b/apmaster.json
index 68cba44..3f18ece 100644
--- a/apmaster.json
+++ b/apmaster.json
@@ -11,25 +11,29 @@
             "type": "urukul",
             "dds": "ad9912",
             "ports": [1, 2],
-            "clk_sel": 2
+            "clk_sel": 2,
+            "synchronization": true
         },
         {
             "type": "urukul",
             "dds": "ad9912",
             "ports": [3, 4],
-            "clk_sel": 2
+            "clk_sel": 2,
+            "synchronization": true
         },
         {
             "type": "urukul",
             "dds": "ad9912",
             "ports": [5, 6],
-            "clk_sel": 2
+            "clk_sel": 2,
+            "synchronization": true
         },
         {
             "type": "urukul",
             "dds": "ad9912",
             "ports": [7, 8],
-            "clk_sel": 2
+            "clk_sel": 2,
+            "synchronization": true
         },
         {
             "type": "dio",
diff --git a/apsatellite1.json b/apsatellite1.json
index e7581a8..f5c9a15 100644
--- a/apsatellite1.json
+++ b/apsatellite1.json
@@ -35,7 +35,8 @@
             "type": "urukul",
             "dds": "ad9910",
             "ports": [4, 5],
-            "clk_sel": 2
+            "clk_sel": 2,
+            "synchronization": true
         },
         {
             "type": "dio",
diff --git a/apsatellite2.json b/apsatellite2.json
index c92c786..2a78401 100644
--- a/apsatellite2.json
+++ b/apsatellite2.json
@@ -13,19 +13,22 @@
             "type": "urukul",
             "dds": "ad9910",
             "ports": [1, 2],
-            "clk_sel": 2
+            "clk_sel": 2,
+            "synchronization": true
         },
         {
             "type": "urukul",
             "dds": "ad9912",
             "ports": [3],
-            "clk_sel": 2
+            "clk_sel": 2,
+            "synchronization": true
         },
         {
             "type": "urukul",
             "dds": "ad9912",
             "ports": [4],
-            "clk_sel": 2
+            "clk_sel": 2,
+            "synchronization": true
         },
         {
             "type": "sampler",