--- /dev/null
+<?xml version="1.0"?>
+<!--
+###################################################
+##Probe Density
+###################################################
+ -->
+<block>
+ <name>Probe Density</name>
+ <key>gr_probe_density_b</key>
+ <import>from grc_gnuradio import blks2 as grc_blks2</import>
+ <make>grc_blks2.probe_density_b(
+ alpha=$alpha,
+ probe_rate=$probe_rate,
+)</make>
+ <callback>set_alpha($alpha)</callback>
+ <callback>set_probe_rate($probe_rate)</callback>
+ <param>
+ <name>Alpha</name>
+ <key>alpha</key>
+ <value>1</value>
+ <type>real</type>
+ </param>
+ <param>
+ <name>Probe Rate</name>
+ <key>probe_rate</key>
+ <value>10</value>
+ <type>real</type>
+ </param>
+ <sink>
+ <name>in</name>
+ <type>byte</type>
+ </sink>
+ <source>
+ <name>out</name>
+ <type>float</type>
+ </source>
+</block>