diff --git a/peak_det_eval.grc b/peak_det_eval.grc
index 230a7b6..c1faf62 100644
--- a/peak_det_eval.grc
+++ b/peak_det_eval.grc
@@ -197,6 +197,69 @@
       <value>8e6</value>
     </param>
   </block>
+  <block>
+    <key>variable_qtgui_range</key>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>0.5</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(0, 796)</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>variable_amp_2</value>
+    </param>
+    <param>
+      <key>label</key>
+      <value>Amplitude</value>
+    </param>
+    <param>
+      <key>min_len</key>
+      <value>200</value>
+    </param>
+    <param>
+      <key>orient</key>
+      <value>Qt.Horizontal</value>
+    </param>
+    <param>
+      <key>start</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>step</key>
+      <value>0.01</value>
+    </param>
+    <param>
+      <key>stop</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>rangeType</key>
+      <value>float</value>
+    </param>
+    <param>
+      <key>widget</key>
+      <value>counter_slider</value>
+    </param>
+  </block>
   <block>
     <key>variable_qtgui_range</key>
     <param>
@@ -213,7 +276,7 @@
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(112, 812)</value>
+      <value>(160, 796)</value>
     </param>
     <param>
       <key>gui_hint</key>
@@ -245,7 +308,7 @@
     </param>
     <param>
       <key>step</key>
-      <value>samp_rate/256</value>
+      <value>samp_rate/1024</value>
     </param>
     <param>
       <key>stop</key>
@@ -335,7 +398,7 @@
     </param>
     <param>
       <key>_enabled</key>
-      <value>0</value>
+      <value>1</value>
     </param>
     <param>
       <key>_coordinate</key>
@@ -374,7 +437,7 @@
     <key>analog_sig_source_x</key>
     <param>
       <key>amp</key>
-      <value>0</value>
+      <value>0.1</value>
     </param>
     <param>
       <key>alias</key>
@@ -437,7 +500,7 @@
     <key>analog_sig_source_x</key>
     <param>
       <key>amp</key>
-      <value>0</value>
+      <value>variable_amp_2</value>
     </param>
     <param>
       <key>alias</key>
@@ -500,7 +563,7 @@
     <key>analog_sig_source_x</key>
     <param>
       <key>amp</key>
-      <value>0</value>
+      <value>0.5</value>
     </param>
     <param>
       <key>alias</key>
@@ -3221,7 +3284,7 @@
     </param>
     <param>
       <key>_enabled</key>
-      <value>1</value>
+      <value>0</value>
     </param>
     <param>
       <key>_coordinate</key>