diff --git a/mopo/src/arpeggiator.cpp b/mopo/src/arpeggiator.cpp
index 1aa77866c0..f5517607f3 100644
--- a/mopo/src/arpeggiator.cpp
+++ b/mopo/src/arpeggiator.cpp
@@ -55,18 +55,19 @@ namespace mopo {
     }
 
     // Check if it's time to play the next note.
+    // FIXME: handle channel
     if (getNumNotes() && new_phase >= 1) {
       int offset = utils::iclamp((1 - phase_) / delta_phase, 0, buffer_size_ - 1);
-      std::pair<mopo_float, mopo_float> note = getNextNote();
-      note_handler_->noteOn(note.first, note.second, offset);
-      last_played_note_ = note.first;
+      std::tuple<mopo_float, mopo_float, int, mopo_float> note = getNextNote();
+      note_handler_->noteOn(std::get<0>(note), std::get<1>(note), offset, std::get<2>(note), std::get<3>(note));
+      last_played_note_ = std::get<0>(note);
       phase_ = new_phase - 1.0;
     }
     else
       phase_ = new_phase;
   }
 
-  std::pair<mopo_float, mopo_float> Arpeggiator::getNextNote() {
+  std::tuple<mopo_float, mopo_float, int, mopo_float> Arpeggiator::getNextNote() {
     int octaves = utils::imax(1, input(kOctaves)->at(0));
     Pattern type =
         static_cast<Pattern>(static_cast<int>(input(kPattern)->at(0)));
@@ -115,7 +116,10 @@ namespace mopo {
     mopo_float base_note = pattern->at(note_index_);
     mopo_float note = base_note + mopo::NOTES_PER_OCTAVE * current_octave_;
     mopo_float velocity = active_notes_[base_note];
-    return std::pair<mopo_float, mopo_float>(note, velocity);
+    int channel = channel_[base_note];
+    mopo_float aftertouch = aftertouch_[base_note];
+
+    return std::tuple<mopo_float, mopo_float, int, mopo_float>(note, velocity, channel, aftertouch);
   }
 
   CircularQueue<mopo_float>& Arpeggiator::getPressedNotes() {
@@ -152,6 +156,8 @@ namespace mopo {
 
   void Arpeggiator::allNotesOff(int sample) {
     active_notes_.clear();
+    channel_.clear();
+    aftertouch_.clear();
     pressed_notes_.clear();
     sustained_notes_.clear();
     ascending_.clear();
@@ -160,7 +166,7 @@ namespace mopo {
     note_handler_->allNotesOff();
   }
 
-  void Arpeggiator::noteOn(mopo_float note, mopo_float velocity, int sample, int channel) {
+  void Arpeggiator::noteOn(mopo_float note, mopo_float velocity, int sample, int channel, mopo_float aftertouch) {
     if (active_notes_.count(note))
       return;
     if (pressed_notes_.size() == 0) {
@@ -169,6 +175,8 @@ namespace mopo {
       phase_ = 1.0;
     }
     active_notes_[note] = velocity;
+    channel_[note] = channel;
+    aftertouch_[note] = aftertouch;
     pressed_notes_.push_back(note);
     addNoteToPatterns(note);
   }
@@ -181,10 +189,30 @@ namespace mopo {
       sustained_notes_.push_back(note);
     else {
       active_notes_.erase(note);
+      channel_.erase(note);
+      aftertouch_.erase(note);
       removeNoteFromPatterns(note);
     }
 
     pressed_notes_.remove(note);
     return kVoiceOff;
   }
+  
+  void Arpeggiator::setAftertouch(mopo_float note, mopo_float aftertouch, int sample) {
+    // TODO: take channel into account
+    for (const auto &n : pressed_notes_) {
+      if (n == note) {
+        aftertouch_[n] = aftertouch;
+      }
+    }  
+  }
+  
+  void Arpeggiator::setPressure(mopo_float pressure, int channel, int sample) {
+    MOPO_ASSERT(channel >= 0 && channel <= mopo::NUM_MIDI_CHANNELS);      
+    for (const auto &n : pressed_notes_) {
+      if (channel_[n] == channel) {
+          aftertouch_[n] = pressure;
+      }
+    }  
+  }
 } // namespace mopo
diff --git a/mopo/src/arpeggiator.h b/mopo/src/arpeggiator.h
index 699ef873e9..52e8652142 100644
--- a/mopo/src/arpeggiator.h
+++ b/mopo/src/arpeggiator.h
@@ -61,16 +61,21 @@ namespace mopo {
 
       int getNumNotes() { return pressed_notes_.size(); }
       CircularQueue<mopo_float>& getPressedNotes();
-      std::pair<mopo_float, mopo_float> getNextNote();
+      // tuple: note, velocity, channel, aftertouch
+      std::tuple<mopo_float, mopo_float, int, mopo_float> getNextNote();
       void addNoteToPatterns(mopo_float note);
       void removeNoteFromPatterns(mopo_float note);
 
       void allNotesOff(int sample = 0) override;
       void noteOn(mopo_float note, mopo_float velocity = 1,
-                  int sample = 0, int channel = 0) override;
+                  int sample = 0, int channel = 0, mopo_float aftertouch = 0) override;
       VoiceEvent noteOff(mopo_float note, int sample = 0) override;
       void sustainOn();
       void sustainOff();
+      
+      void setAftertouch(mopo_float note, mopo_float aftertouch, int sample = 0);
+      void setPressure(mopo_float pressure, int channel = 0, int sample = 0);
+      
 
     private:
       Arpeggiator() : Processor(0, 0) { }
@@ -89,8 +94,12 @@ namespace mopo {
       std::vector<mopo_float> decending_;
 
       std::map<mopo_float, mopo_float> active_notes_;
+      std::map<mopo_float, int> channel_;
+      std::map<mopo_float, mopo_float> aftertouch_;
+
       CircularQueue<mopo_float> pressed_notes_;
       CircularQueue<mopo_float> sustained_notes_;
+      
   };
 } // namespace mopo
 
diff --git a/mopo/src/note_handler.h b/mopo/src/note_handler.h
index a99ed32fef..db724aac62 100644
--- a/mopo/src/note_handler.h
+++ b/mopo/src/note_handler.h
@@ -27,7 +27,7 @@ namespace mopo {
       virtual ~NoteHandler() { }
       virtual void allNotesOff(int sample = 0) = 0;
       virtual void noteOn(mopo_float note, mopo_float velocity = 1,
-                          int sample = 0, int channel = 0) = 0;
+                          int sample = 0, int channel = 0, mopo_float aftertouch = 0) = 0;
       virtual VoiceEvent noteOff(mopo_float note, int sample = 0) = 0;
   };
 } // namespace mopo
diff --git a/mopo/src/voice_handler.cpp b/mopo/src/voice_handler.cpp
index ef3b664afa..78d50bcb59 100644
--- a/mopo/src/voice_handler.cpp
+++ b/mopo/src/voice_handler.cpp
@@ -290,7 +290,7 @@ namespace mopo {
     return 0;
   }
 
-  void VoiceHandler::noteOn(mopo_float note, mopo_float velocity, int sample, int channel) {
+  void VoiceHandler::noteOn(mopo_float note, mopo_float velocity, int sample, int channel, mopo_float aftertouch) {
     MOPO_ASSERT(sample >= 0 && sample < buffer_size_);
     MOPO_ASSERT(channel >= 0 && channel < NUM_MIDI_CHANNELS);
 
@@ -299,7 +299,7 @@ namespace mopo {
 
     if (last_played_note_ < 0)
       last_played_note_ = note;
-    voice->activate(note, velocity, last_played_note_, pressed_notes_.size(), sample, channel);
+    voice->activate(note, velocity, last_played_note_, pressed_notes_.size(), sample, channel, aftertouch);
     active_voices_.push_back(voice);
     last_played_note_ = note;
   }
@@ -323,7 +323,7 @@ namespace mopo {
             pressed_notes_.pop_back();
             pressed_notes_.push_front(old_note);
             new_voice->activate(old_note, voice->state().velocity, last_played_note_,
-                                pressed_notes_.size() + 1, sample);
+            pressed_notes_.size() + 1, sample);
             last_played_note_ = old_note;
 
             voice_event = kVoiceReset;
@@ -342,6 +342,14 @@ namespace mopo {
         voice->setAftertouch(aftertouch, sample);
     }
   }
+  
+  void VoiceHandler::setPressure(mopo_float pressure, int channel, int sample) {
+    MOPO_ASSERT(channel >= 0 && channel <= mopo::NUM_MIDI_CHANNELS);
+    for (Voice* voice : active_voices_) {              
+      if (voice->state().channel == channel)
+        voice->setAftertouch(pressure, sample);
+    }    
+  }
 
   void VoiceHandler::setPolyphony(size_t polyphony) {
     while (all_voices_.size() < polyphony) {
diff --git a/mopo/src/voice_handler.h b/mopo/src/voice_handler.h
index a9e1001bb2..6350ddece8 100644
--- a/mopo/src/voice_handler.h
+++ b/mopo/src/voice_handler.h
@@ -59,7 +59,7 @@ namespace mopo {
 
       void activate(mopo_float note, mopo_float velocity,
                     mopo_float last_note, int note_pressed = 0,
-                    int sample = 0, int channel = 0) {
+                    int sample = 0, int channel = 0, mopo_float aftertouch = 0) {
         event_sample_ = sample;
         state_.event = kVoiceOn;
         state_.note = note;
@@ -67,7 +67,7 @@ namespace mopo {
         state_.last_note = last_note;
         state_.note_pressed = note_pressed;
         state_.channel = channel;
-        aftertouch_ = velocity;
+        aftertouch_ = aftertouch;
         aftertouch_sample_ = sample;
         key_state_ = kHeld;
       }
@@ -143,9 +143,10 @@ namespace mopo {
 
       void allNotesOff(int sample = 0) override;
       virtual void noteOn(mopo_float note, mopo_float velocity = 1,
-                          int sample = 0, int channel = 0) override;
+                          int sample = 0, int channel = 0, mopo_float aftertouch = 0) override;
       virtual VoiceEvent noteOff(mopo_float note, int sample = 0) override;
       void setAftertouch(mopo_float note, mopo_float aftertouch, int sample = 0);
+      void setPressure(mopo_float pressure, int channel = 0, int sample = 0);
       void sustainOn();
       void sustainOff(int sample = 0);
 
diff --git a/src/common/midi_manager.cpp b/src/common/midi_manager.cpp
index 3539343919..6724b43729 100644
--- a/src/common/midi_manager.cpp
+++ b/src/common/midi_manager.cpp
@@ -91,7 +91,7 @@ void MidiManager::removeNextBlockOfMessages(MidiBuffer& buffer, int num_samples)
   midi_collector_.removeNextBlockOfMessages(buffer, num_samples);
 }
 
-void MidiManager::processMidiMessage(const MidiMessage& midi_message, int sample_position) {
+void MidiManager::processMidiMessage(const MidiMessage& midi_message, int sample_position) {              
   if (midi_message.isProgramChange()) {
     current_patch_ = midi_message.getProgramChangeNumber();
     File patch = LoadSave::loadPatch(current_bank_, current_folder_, current_patch_,
@@ -114,11 +114,20 @@ void MidiManager::processMidiMessage(const MidiMessage& midi_message, int sample
     engine_->sustainOn();
   else if (midi_message.isSustainPedalOff())
     engine_->sustainOff();
+  // "aftertouch" is pressure per note
   else if (midi_message.isAftertouch()) {
     mopo::mopo_float note = midi_message.getNoteNumber();
     mopo::mopo_float value = (1.0 * midi_message.getAfterTouchValue()) / mopo::MIDI_SIZE;
     engine_->setAftertouch(note, value);
   }
+  // "pressure" is aftertouch for a whole channel (e.g. keyboard send only one value even if several keys are pressed)
+  // TODO: create a separate modifier
+  else if (midi_message.isChannelPressure()) {
+    mopo::mopo_float note = midi_message.getNoteNumber();
+    mopo::mopo_float value = (1.0 * midi_message.getChannelPressureValue()) / (mopo::MIDI_SIZE - 1.0);
+    // channel - 1 as with NoteOn above
+    engine_->setPressure(value, midi_message.getChannel() - 1, sample_position);
+  }
   else if (midi_message.isPitchWheel()) {
     double percent = (1.0 * midi_message.getPitchWheelValue()) / PITCH_WHEEL_RESOLUTION;
     double value = 2 * percent - 1.0;
diff --git a/src/synthesis/helm_engine.cpp b/src/synthesis/helm_engine.cpp
index 894653cb48..d638a38834 100644
--- a/src/synthesis/helm_engine.cpp
+++ b/src/synthesis/helm_engine.cpp
@@ -376,11 +376,11 @@ namespace mopo {
     arpeggiator_->allNotesOff(sample);
   }
 
-  void HelmEngine::noteOn(mopo_float note, mopo_float velocity, int sample, int channel) {
+  void HelmEngine::noteOn(mopo_float note, mopo_float velocity, int sample, int channel, mopo_float aftertouch) {
     if (arp_on_->value())
-      arpeggiator_->noteOn(note, velocity, sample);
+      arpeggiator_->noteOn(note, velocity, sample, channel, aftertouch);
     else
-      voice_handler_->noteOn(note, velocity, sample, channel);
+      voice_handler_->noteOn(note, velocity, sample, channel, aftertouch);
   }
 
   VoiceEvent HelmEngine::noteOff(mopo_float note, int sample) {
@@ -396,8 +396,17 @@ namespace mopo {
   void HelmEngine::setPitchWheel(mopo_float value, int channel) {
     voice_handler_->setPitchWheel(value, channel);
   }
+  
+  void HelmEngine::setPressure(mopo_float value, int channel, int sample) {
+    if (arp_on_->value())
+      arpeggiator_->setPressure(value, channel, sample);
+    voice_handler_->setPressure(value, channel, sample);
+  }
 
   void HelmEngine::setAftertouch(mopo_float note, mopo_float value, int sample) {
+    // TODO: take channel into account
+    if (arp_on_->value())
+      arpeggiator_->setAftertouch(note, value, sample);
     voice_handler_->setAftertouch(note, value, sample);
   }
 
diff --git a/src/synthesis/helm_engine.h b/src/synthesis/helm_engine.h
index 2790446e3d..b8966168fb 100644
--- a/src/synthesis/helm_engine.h
+++ b/src/synthesis/helm_engine.h
@@ -52,13 +52,14 @@ namespace mopo {
       // Keyboard events.
       void allNotesOff(int sample = 0) override;
       void noteOn(mopo_float note, mopo_float velocity = 1.0,
-                  int sample = 0, int channel = 0) override;
+                  int sample = 0, int channel = 0, mopo_float aftertouch = 0) override;
       VoiceEvent noteOff(mopo_float note, int sample = 0) override;
       void setModWheel(mopo_float value, int channel = 0);
       void setPitchWheel(mopo_float value, int channel = 0);
       void setBpm(mopo_float bpm);
       void correctToTime(mopo_float samples) override;
       void setAftertouch(mopo_float note, mopo_float value, int sample = 0);
+      void setPressure(mopo_float value, int channel = 0, int sample = 0);
 
       // Sustain pedal events.
       void sustainOn();
diff --git a/src/synthesis/helm_voice_handler.cpp b/src/synthesis/helm_voice_handler.cpp
index 97dddd2d07..d8b9eede3e 100644
--- a/src/synthesis/helm_voice_handler.cpp
+++ b/src/synthesis/helm_voice_handler.cpp
@@ -756,10 +756,10 @@ namespace mopo {
     }
   }
 
-  void HelmVoiceHandler::noteOn(mopo_float note, mopo_float velocity, int sample, int channel) {
+  void HelmVoiceHandler::noteOn(mopo_float note, mopo_float velocity, int sample, int channel, mopo_float aftertouch) {
     if (getPressedNotes().size() < polyphony() || legato_->value() == 0.0)
       note_retriggered_.trigger(note, sample);
-    VoiceHandler::noteOn(note, velocity, sample, channel);
+    VoiceHandler::noteOn(note, velocity, sample, channel, aftertouch);
   }
 
   VoiceEvent HelmVoiceHandler::noteOff(mopo_float note, int sample) {
diff --git a/src/synthesis/helm_voice_handler.h b/src/synthesis/helm_voice_handler.h
index ed521dd047..47a086115d 100644
--- a/src/synthesis/helm_voice_handler.h
+++ b/src/synthesis/helm_voice_handler.h
@@ -53,7 +53,7 @@ namespace mopo {
 
       void process() override;
       void noteOn(mopo_float note, mopo_float velocity = 1,
-                  int sample = 0, int channel = 0) override;
+                  int sample = 0, int channel = 0, mopo_float aftertouch = 0) override;
       VoiceEvent noteOff(mopo_float note, int sample = 0) override;
       bool shouldAccumulate(Output* output) override;
       void setModWheel(mopo_float value, int channel = 0);