diff --git a/src/OutputChannel.js b/src/OutputChannel.js
index 491b0ddaa..d3df4600a 100644
--- a/src/OutputChannel.js
+++ b/src/OutputChannel.js
@@ -1132,10 +1132,13 @@ export class OutputChannel extends EventEmitter {
 
     }
 
+    // Normalize pressure to integer
+    if (!options.rawValue) pressure = Utilities.fromFloatTo7Bit(pressure);
+
     this.send(
       [
         (Enumerations.CHANNEL_MESSAGES.channelaftertouch << 4) + (this.number - 1),
-        Math.round(pressure * 127)
+        Math.round(pressure)
       ],
       {time: Utilities.toTimestamp(options.time)}
     );
diff --git a/test/OutputChannel.test.js b/test/OutputChannel.test.js
index 2c428f2ea..cf643aeb2 100644
--- a/test/OutputChannel.test.js
+++ b/test/OutputChannel.test.js
@@ -1892,7 +1892,7 @@ describe("OutputChannel Object", function() {
 
   describe("sendChannelAftertouch()", function () {
 
-    it("should send correct MIDI message when using float", function(done) {
+    it("should send correct MIDI message when using float (0-1)", function(done) {
 
       // Arrange
       let index = 0;
@@ -1924,6 +1924,31 @@ describe("OutputChannel Object", function() {
 
     });
 
+    it("should send correct MIDI message when using integer (0-127)", function(done) {
+
+      // Arrange
+      let index = 0;
+      VIRTUAL_OUTPUT.on("message", assert);
+
+      // Act
+      for (let i = 0; i < 128; i++) {
+        WEBMIDI_OUTPUT.channels[1].sendChannelAftertouch(i, {rawValue: true});
+      }
+
+      // Assert
+      function assert(deltaTime, message) {
+
+        expect(message[1]).to.equal(index++);
+
+        if (index >= 128) {
+          VIRTUAL_OUTPUT.removeAllListeners();
+          done();
+        }
+
+      }
+
+    });
+
     it("should throw error when invalid pressure is specified", function() {
 
       // Arrange