diff --git a/src/common/helm_common.h b/src/common/helm_common.h
index a907babd..9ce5b0d5 100644
--- a/src/common/helm_common.h
+++ b/src/common/helm_common.h
@@ -182,6 +182,7 @@ namespace mopo {
   const std::wstring DEFAULT_KEYBOARD = L"awsedftgyhujkolp;'";
   const wchar_t DEFAULT_KEYBOARD_OCTAVE_UP = 'x';
   const wchar_t DEFAULT_KEYBOARD_OCTAVE_DOWN = 'z';
+  const wchar_t DEFAULT_KEYBOARD_SUSTAIN_PEDAL = 'n';
 
   const std::string PATCH_EXTENSION = "helm";
 
@@ -254,10 +255,14 @@ namespace mopo {
       wchar_t getDownKey() { return down_key_; }
       void setDownKey(wchar_t down_key) { down_key_ = down_key; }
 
+      wchar_t getSustainPedalKey() { return sustain_pedal_key_; }
+      void setSustainPedalKey(wchar_t key) { sustain_pedal_key_ = key; }
+
     protected:
       std::wstring layout_;
       int up_key_;
       int down_key_;
+      int sustain_pedal_key_;
   };
 
   class ValueDetailsLookup {
diff --git a/src/common/midi_manager.cpp b/src/common/midi_manager.cpp
index b24131ef..faae0775 100644
--- a/src/common/midi_manager.cpp
+++ b/src/common/midi_manager.cpp
@@ -114,6 +114,10 @@ void MidiManager::processMidiMessage(const MidiMessage& midi_message, int sample
     engine_->noteOff(midi_message.getNoteNumber());
   else if (midi_message.isAllNotesOff())
     engine_->allNotesOff();
+  else if (midi_message.isAllSoundOff()) {
+    engine_->allNotesOff();
+    engine_->sustainOff();
+  }
   else if (midi_message.isSustainPedalOn())
     engine_->sustainOn();
   else if (midi_message.isSustainPedalOff())
diff --git a/src/standalone/helm_computer_keyboard.cpp b/src/standalone/helm_computer_keyboard.cpp
index 6615b54f..d4d90a13 100644
--- a/src/standalone/helm_computer_keyboard.cpp
+++ b/src/standalone/helm_computer_keyboard.cpp
@@ -27,6 +27,7 @@ HelmComputerKeyboard::HelmComputerKeyboard(mopo::HelmEngine* synth,
   layout_ = mopo::DEFAULT_KEYBOARD;
   up_key_ = mopo::DEFAULT_KEYBOARD_OCTAVE_UP;
   down_key_ = mopo::DEFAULT_KEYBOARD_OCTAVE_DOWN;
+  sustain_pedal_key_ = mopo::DEFAULT_KEYBOARD_SUSTAIN_PEDAL;
 }
 
 HelmComputerKeyboard::~HelmComputerKeyboard() {
@@ -96,5 +97,18 @@ bool HelmComputerKeyboard::keyStateChanged(bool isKeyDown, Component *origin) {
   else
     keys_pressed_.erase(' ');
 
+  if (KeyPress::isKeyCurrentlyDown(sustain_pedal_key_) &&
+      !keys_pressed_.count(sustain_pedal_key_) && isKeyDown) {
+    keys_pressed_.insert(sustain_pedal_key_);
+    synth_->sustainOn();
+    consumed = true;
+  }
+  else if (!KeyPress::isKeyCurrentlyDown(sustain_pedal_key_) &&
+           keys_pressed_.count(sustain_pedal_key_)) {
+    keys_pressed_.erase(sustain_pedal_key_);
+    synth_->sustainOff();
+    consumed = true;
+  }
+
   return consumed;
 }