diff --git a/function/smooth/17-smooth.html b/function/smooth/17-smooth.html
index 7fa06e74..5de5af16 100644
--- a/function/smooth/17-smooth.html
+++ b/function/smooth/17-smooth.html
@@ -21,6 +21,13 @@
         <label for="node-input-round">(optionally)</label>
         round to <input type="text" id="node-input-round" placeholder="ignore" style="width:50px;"/> decimal places
     </div>
+    <div class="form-row">
+    <label for="node-input-mult">Treat</label>
+        <select id="node-input-mult" style="width:60%; margin-right:5px;">
+            <option value="single">All msg as one stream.</option>
+            <option value="multi">Different msg.topic as individual streams.</option>
+        </select>
+    </div>
     <br/>
     <div class="form-row">
         <label for="node-input-name"><i class="fa fa-tag"></i> Name</label>
@@ -31,6 +38,7 @@
 
 <script type="text/x-red" data-help-name="smooth">
     <p>A simple node to provide various functions across several previous values, including max, min, mean, high and low pass filters.</p>
+    <p>Messages arriving with different <code>msg.topic</code> can be treated as separate streams if so configured.</p>
     <p>Max, Min and Mean work over a specified number of previous values.</p>
     <p>The High and Low pass filters use a smoothing factor. The higher the number the more the smoothing. E.g. a value of 10 is
     similar to an &alpha; of 0.1. It is analagous to an RC time constant - but there is no time component to this as the
@@ -47,7 +55,8 @@
             name: {value:""},
             action: {value:"mean"},
             count: {value:"10",required:true,validate:RED.validators.number()},
-            round: {value:""}
+            round: {value:""},
+            mult: {value:"single"}
         },
         inputs: 1,
         outputs: 1,
diff --git a/function/smooth/17-smooth.js b/function/smooth/17-smooth.js
index 14e69af4..c7fa914a 100644
--- a/function/smooth/17-smooth.js
+++ b/function/smooth/17-smooth.js
@@ -8,48 +8,50 @@ module.exports = function(RED) {
         this.round = n.round || false;
         if (this.round == "true") { this.round = 0; }
         this.count = Number(n.count);
+        this.mult = n.mult || "single";
         var node = this;
-        var a = [];
-        var tot = 0;
-        var tot2 = 0;
-        var pop = 0;
-        var old = null;
+        var v = {};
 
         this.on('input', function (msg) {
-            if (msg.hasOwnProperty("reset")) {
-                a = [];
-                tot = 0;
-                tot2 = 0;
-                pop = 0;
-                old = null;
+            var top = msg.topic || "_my_default_topic";
+            if (this.mult === "single") { top = "a"; }
+
+            if ((v.hasOwnProperty(top) !== true) || msg.hasOwnProperty("reset")) {
+                v[top] = {};
+                v[top].a = [];
+                v[top].tot = 0;
+                v[top].tot2 = 0;
+                v[top].pop = 0;
+                v[top].old = null;
+                v[top].count = this.count;
             }
             if (msg.hasOwnProperty("payload")) {
                 var n = Number(msg.payload);
                 if (!isNaN(n)) {
                     if ((node.action === "low") || (node.action === "high")) {
-                        if (old == null) { old = n; }
-                        old = old + (n - old) / node.count;
-                        if (node.action === "low") { msg.payload = old; }
-                        else { msg.payload = n - old; }
+                        if (v[top].old == null) { v[top].old = n; }
+                        v[top].old = v[top].old + (n - v[top].old) / v[top].count;
+                        if (node.action === "low") { msg.payload = v[top].old; }
+                        else { msg.payload = n - v[top].old; }
                     }
                     else {
-                        a.push(n);
-                        if (a.length > node.count) { pop = a.shift(); }
+                        v[top].a.push(n);
+                        if (v[top].a.length > v[top].count) { v[top].pop = v[top].a.shift(); }
                         if (node.action === "max") {
-                            msg.payload = Math.max.apply(Math, a);
+                            msg.payload = Math.max.apply(Math, v[top].a);
                         }
                         if (node.action === "min") {
-                            msg.payload = Math.min.apply(Math, a);
+                            msg.payload = Math.min.apply(Math, v[top].a);
                         }
                         if (node.action === "mean") {
-                            tot = tot + n - pop;
-                            msg.payload = tot / a.length;
+                            v[top].tot = v[top].tot + n - v[top].pop;
+                            msg.payload = v[top].tot / v[top].a.length;
                         }
                         if (node.action === "sd") {
-                            tot = tot + n - pop;
-                            tot2 = tot2 + (n*n) - (pop * pop);
-                            if (a.length > 1) {
-                                msg.payload = Math.sqrt((a.length * tot2 - tot * tot)/(a.length * (a.length - 1)));
+                            v[top].tot = v[top].tot + n - v[top].pop;
+                            v[top].tot2 = v[top].tot2 + (n*n) - (v[top].pop * v[top].pop);
+                            if (v[top].a.length > 1) {
+                                msg.payload = Math.sqrt((v[top].a.length * v[top].tot2 - v[top].tot * v[top].tot)/(v[top].a.length * (v[top].a.length - 1)));
                             }
                             else { msg.payload = 0; }
                         }
diff --git a/function/smooth/package.json b/function/smooth/package.json
index 3c0654f2..349362fe 100644
--- a/function/smooth/package.json
+++ b/function/smooth/package.json
@@ -1,6 +1,6 @@
 {
     "name"          : "node-red-node-smooth",
-    "version"       : "0.0.10",
+    "version"       : "0.0.11",
     "description"   : "A Node-RED node that provides several simple smoothing algorithms for incoming data values.",
     "dependencies"  : {
     },
diff --git a/hardware/pigpiod/pi-gpiod.html b/hardware/pigpiod/pi-gpiod.html
index 82ff473f..507e63f6 100644
--- a/hardware/pigpiod/pi-gpiod.html
+++ b/hardware/pigpiod/pi-gpiod.html
@@ -458,7 +458,7 @@
             else if (this.out === "ser") { return this.name || "Servo: "+bcm2pin[this.pin]; }
             else {
                 var suf = "";
-                if (this.set == true) { suf = (this.level === "1") ? "¹ " : "₀ "; }
+                if (this.set === true) { suf = (this.level === "1") ? "¹ " : "₀ "; }
                 return this.name || "PIN: " + bcm2pin[this.pin] + suf ;
             }
         },
diff --git a/test/function/smooth/17-smooth_spec.js b/test/function/smooth/17-smooth_spec.js
index 3408151a..6145a94e 100644
--- a/test/function/smooth/17-smooth_spec.js
+++ b/test/function/smooth/17-smooth_spec.js
@@ -219,4 +219,56 @@ describe('smooth node', function() {
         });
     });
 
+    it('should average over a number of inputs on different topics', function(done) {
+        var flow = [{"id":"n1", "type":"smooth", action:"mean", count:"5", wires:[["n2"]] },
+            {id:"n2", type:"helper"} ];
+        helper.load(testNode, flow, function() {
+            var n1 = helper.getNode("n1");
+            var n2 = helper.getNode("n2");
+            var c = 0;
+            n2.on("input", function(msg) {
+                c += 1;
+                if (c === 3) { msg.should.have.a.property("payload", 1); }
+                if (c === 5) { msg.should.have.a.property("payload", 2); }
+                if (c === 6) { msg.should.have.a.property("payload", 3); }
+                if (c === 7) { msg.should.have.a.property("payload", 3); done(); }
+            });
+            n1.emit("input", {payload:2, topic:"A"});
+            n1.emit("input", {payload:1, topic:"A"});
+            n1.emit("input", {payload:0, topic:"A"});
+            n1.emit("input", {payload:3, topic:"B"});
+            n1.emit("input", {payload:4, topic:"B"});
+            n1.emit("input", {payload:7, topic:"A"});
+            n1.emit("input", {payload:1, topic:"B"});
+        });
+    });
+
+    it('should average over different topics if asked', function(done) {
+        var flow = [{"id":"n1", "type":"smooth", action:"mean", count:"5", mult:"true", wires:[["n2"]] },
+            {id:"n2", type:"helper"} ];
+        helper.load(testNode, flow, function() {
+            var n1 = helper.getNode("n1");
+            var n2 = helper.getNode("n2");
+            var c = 0;
+            n2.on("input", function(msg) {
+                c += 1;
+                if (c === 3) { msg.should.have.a.property("payload", 1); }
+                if (c === 5) { msg.should.have.a.property("payload", 4); }
+                if (c === 9) { msg.should.have.a.property("payload", 4); }
+                if (c === 11) { msg.should.have.a.property("payload", 5); done(); }
+            });
+            n1.emit("input", {payload:2, topic:"A"});
+            n1.emit("input", {payload:1, topic:"A"});
+            n1.emit("input", {payload:0, topic:"A"});
+            n1.emit("input", {payload:3, topic:"B"});
+            n1.emit("input", {payload:5, topic:"B"});
+            n1.emit("input", {payload:5, topic:"A"});
+            n1.emit("input", {payload:2, topic:"B"});
+            n1.emit("input", {payload:7, topic:"A"});
+            n1.emit("input", {payload:3, topic:"A"});
+            n1.emit("input", {payload:6, topic:"B"});
+            n1.emit("input", {payload:9, topic:"B"});
+        });
+    });
+
 });