diff --git a/core/audio/mixer/mixer_track.cpp b/core/audio/mixer/mixer_track.cpp
index 3a7b359..33a90ed 100644
--- a/core/audio/mixer/mixer_track.cpp
+++ b/core/audio/mixer/mixer_track.cpp
@@ -18,6 +18,7 @@ void mixer_track::init() {
     buffer.resize(channel_count, g_audio_device_manager.get_buffer_size());
     for (int i = 0; i < buffer.get_num_channels(); ++i) {
         ui_buffers->emplace_back(g_audio_device_manager.get_buffer_size() * 2);
+        ui_buffer_peaks.emplace_back();
     }
 
     channel_interface_ = new mixer_channel_interface(this);
diff --git a/core/audio/mixer/mixer_track.h b/core/audio/mixer/mixer_track.h
index 4db7692..17f4a31 100644
--- a/core/audio/mixer/mixer_track.h
+++ b/core/audio/mixer/mixer_track.h
@@ -18,6 +18,11 @@ struct mixer_track_link {
     float send_level;
 };
 
+struct mixer_track_peak {
+    sample_t peak;
+    float left_time;
+};
+
 class CORE_API mixer_track {
 public:
     explicit mixer_track(mixer_track_type in_type) : type_(in_type) {
@@ -47,12 +52,15 @@ public:
     [[nodiscard]] float get_volume() const { return volume; }
 
     audio_buffer buffer;
-    std::shared_ptr<circular_buffer_vector_type> ui_buffers;
     std::vector<plugin_host*> effects{};
     std::vector<mixer_track_link> children{};
     multicast_delegate<mixer_track*> on_processed;
     multicast_delegate<plugin_host*> on_add_effect;
     multicast_delegate<plugin_host*> on_remove_effect;
+
+    // UI
+    std::shared_ptr<circular_buffer_vector_type> ui_buffers;
+    std::vector<mixer_track_peak> ui_buffer_peaks;
 private:
     const mixer_track_type type_;
     std::atomic<float> volume = 1.0f;
diff --git a/core/window/window_manager.cpp b/core/window/window_manager.cpp
index 4815858..d47f8ba 100644
--- a/core/window/window_manager.cpp
+++ b/core/window/window_manager.cpp
@@ -76,7 +76,6 @@ void window_manager::destroy_plugin_window(plugin_host* host) {
 }
 
 void window_manager::update() {
-    // glfwPollEvents();
     for (auto& info : host_infos_) {
         if (!info.second.window) {
             continue;