diff --git a/core/application/command_line.h b/core/application/command_line.h
index 6b17ddf..4f11591 100644
--- a/core/application/command_line.h
+++ b/core/application/command_line.h
@@ -1,6 +1,6 @@
 #pragma once
-#include <map>
 #include <string>
+#include <unordered_map>
 
 class command_line {
 public:
@@ -20,6 +20,6 @@ public:
     void get_arg(const std::string& key, bool& out) const;
 
 private:
-    std::map<std::string, std::string> args_; // key-value pairs
+    std::unordered_map<std::string, std::string> args_; // key-value pairs
     command_line() = default;
 };
diff --git a/core/audio/device/audio_device_manager.cpp b/core/audio/device/audio_device_manager.cpp
index 40e6aa2..394e10d 100644
--- a/core/audio/device/audio_device_manager.cpp
+++ b/core/audio/device/audio_device_manager.cpp
@@ -38,7 +38,8 @@ void audio_device_manager::release(singleton_release_guard& release_guard) {
     singleton_t<audio_device_manager>::release(release_guard);
     stop_render_thread();
     release_guard.require_release<mixer>();
-    audio_->stopStream();
+    if (audio_)
+        audio_->stopStream();
     delete audio_;
 }
 
@@ -76,6 +77,7 @@ uint32_t audio_device_manager::get_sample_rate() const {
 
 void audio_device_manager::set_sample_rate(uint32_t sample_rate) {
     sample_rate_ = sample_rate;
+    on_sample_rate_changed.broadcast(sample_rate_);
 }
 
 uint32_t audio_device_manager::get_buffer_size() const {
@@ -164,7 +166,7 @@ void audio_device_manager::render_thread() {
 //            std::this_thread::yield();
             continue;
         }
-        g_midi_sequencer.process(rate, frames);
+        g_midi_sequencer.process(get_sample_rate(), frames);
         g_mixer.reset();
         g_plugin_host_manager.process(frames);
         g_mixer.process(frames);
diff --git a/core/audio/device/audio_device_manager.h b/core/audio/device/audio_device_manager.h
index 8399b18..f35acad 100644
--- a/core/audio/device/audio_device_manager.h
+++ b/core/audio/device/audio_device_manager.h
@@ -3,6 +3,7 @@
 
 #include "audio/misc/circular_audio_buffer.h"
 #include "RtAudio.h"
+#include "misc/delegates.h"
 
 class audio_device_manager : public singleton_t<audio_device_manager> {
 public:
@@ -23,6 +24,8 @@ public:
     int stream_callback(sample_t* output, sample_t* input, unsigned long frame_count, double stream_time, RtAudioStreamStatus status);
     void log_all_devices();
     void log_current_device_info();
+
+    multicast_delegate<uint32_t> on_sample_rate_changed;
 protected:
 #pragma region render_thread
     void start_render_thread();
diff --git a/core/audio/mixer/channel_interface.cpp b/core/audio/mixer/channel_interface.cpp
index ef0a2a6..0152a57 100644
--- a/core/audio/mixer/channel_interface.cpp
+++ b/core/audio/mixer/channel_interface.cpp
@@ -92,22 +92,22 @@ void channel_interface::set_output_channel_node_name(uint32_t node_index, uint32
     output_channel_names_[node_index][channel_index] = name;
 }
 
-std::map<uint32_t, std::string> channel_interface::get_input_channel_node_name(uint32_t node_index) {
+std::unordered_map<uint32_t, std::string> channel_interface::get_input_channel_node_name(uint32_t node_index) {
     return input_channel_names_[node_index];
 }
 
-std::map<uint32_t, std::string> channel_interface::get_input_channel_node_name(channel_node* node) {
+std::unordered_map<uint32_t, std::string> channel_interface::get_input_channel_node_name(channel_node* node) {
     uint32_t index = get_input_node_index(node);
     if (index == -1)
         return {};
     return get_input_channel_node_name(index);
 }
 
-std::map<uint32_t, std::string> channel_interface::get_output_channel_node_name(uint32_t node_index) {
+std::unordered_map<uint32_t, std::string> channel_interface::get_output_channel_node_name(uint32_t node_index) {
     return output_channel_names_[node_index];
 }
 
-std::map<uint32_t, std::string> channel_interface::get_output_channel_node_name(channel_node* node) {
+std::unordered_map<uint32_t, std::string> channel_interface::get_output_channel_node_name(channel_node* node) {
     uint32_t index = get_output_node_index(node);
     if (index == -1)
         return {};
diff --git a/core/audio/mixer/channel_interface.h b/core/audio/mixer/channel_interface.h
index 788f690..e536b39 100644
--- a/core/audio/mixer/channel_interface.h
+++ b/core/audio/mixer/channel_interface.h
@@ -1,6 +1,6 @@
 #pragma once
 #include <cstdint>
-#include <map>
+#include <unordered_map>
 #include <string>
 #include <vector>
 
@@ -27,18 +27,18 @@ public:
 
     void set_input_channel_node_name(uint32_t node_index, uint32_t channel_index, const std::string& name);
     void set_output_channel_node_name(uint32_t node_index, uint32_t channel_index, const std::string& name);
-    std::map<uint32_t, std::string> get_input_channel_node_name(uint32_t node_index);
-    std::map<uint32_t, std::string> get_input_channel_node_name(channel_node* node);
-    std::map<uint32_t, std::string> get_output_channel_node_name(uint32_t node_index);
-    std::map<uint32_t, std::string> get_output_channel_node_name(channel_node* node);
+    std::unordered_map<uint32_t, std::string> get_input_channel_node_name(uint32_t node_index);
+    std::unordered_map<uint32_t, std::string> get_input_channel_node_name(channel_node* node);
+    std::unordered_map<uint32_t, std::string> get_output_channel_node_name(uint32_t node_index);
+    std::unordered_map<uint32_t, std::string> get_output_channel_node_name(channel_node* node);
 
     void remove_track(mixer_track* track);
 
     std::vector<channel_node*> input_channel_nodes;
     std::vector<channel_node*> output_channel_nodes;
 private:
-    std::map<uint32_t, std::map<uint32_t, std::string>> input_channel_names_;
-    std::map<uint32_t, std::map<uint32_t, std::string>> output_channel_names_;
+    std::unordered_map<uint32_t, std::unordered_map<uint32_t, std::string>> input_channel_names_;
+    std::unordered_map<uint32_t, std::unordered_map<uint32_t, std::string>> output_channel_names_;
     std::vector<sample_t*> input_headers_;
     std::vector<sample_t*> output_headers_;
 };
diff --git a/core/audio/mixer/mixer.cpp b/core/audio/mixer/mixer.cpp
index ae8269c..87569f9 100644
--- a/core/audio/mixer/mixer.cpp
+++ b/core/audio/mixer/mixer.cpp
@@ -11,7 +11,7 @@
 
 IMPL_SINGLETON_INSTANCE(mixer)
 
-void build_effect_channel_interface(mixer_track* track, const channel_interface* in_interface, std::map<mixer_track*, int32_t>& processed_tracks) {
+void build_effect_channel_interface(mixer_track* track, const channel_interface* in_interface, std::unordered_map<mixer_track*, int32_t>& processed_tracks) {
     int32_t& track_current_layer = processed_tracks[track];
     auto& input_channel_nodes = in_interface->input_channel_nodes;
     auto& output_channel_nodes = in_interface->output_channel_nodes;
@@ -38,7 +38,7 @@ void build_effect_channel_interface(mixer_track* track, const channel_interface*
     }
 }
 
-int32_t build_process_node_internal(mixer_track* track, std::map<mixer_track*, int32_t>& processed_tracks, int32_t layer) {
+int32_t build_process_node_internal(mixer_track* track, std::unordered_map<mixer_track*, int32_t>& processed_tracks, int32_t layer) {
     int32_t& track_current_layer = processed_tracks[track];
     track_current_layer = std::max(track_current_layer, layer);
     for (const mixer_track_link& child_link: track->children) {
@@ -51,7 +51,7 @@ int32_t build_process_node_internal(mixer_track* track, std::map<mixer_track*, i
     return ++layer;
 }
 
-void build_instrument_process_node(const plugin_host* host, std::map<mixer_track*, int32_t>& processed_tracks) {
+void build_instrument_process_node(const plugin_host* host, std::unordered_map<mixer_track*, int32_t>& processed_tracks) {
     for (mixer_track* Track : host->owner_tracks) {
         build_effect_channel_interface(Track, host->channel, processed_tracks);
     }
@@ -140,7 +140,7 @@ void mixer::reset() {
 void mixer::build_process_node() {
     if (tracks_.empty())
         return;
-    std::map<mixer_track*, int32_t> processed_tracks;
+    std::unordered_map<mixer_track*, int32_t> processed_tracks;
     auto* master = get_master();
     build_process_node_internal(master, processed_tracks, 0);
     const auto& instruments = g_plugin_host_manager.get_plugin_hosts();
@@ -235,6 +235,7 @@ void mixer::update_taskflow(uint32_t in_frames) {
 void mixer::begin_release(singleton_release_guard &release_guard) {
     singleton::begin_release(release_guard);
     auto e = executor_.exchange(nullptr);
-    e->wait_for_all();
+    if (e)
+        e->wait_for_all();
     delete e;
 }
diff --git a/core/audio/mixer/mixer.h b/core/audio/mixer/mixer.h
index d4c12ad..efcc439 100644
--- a/core/audio/mixer/mixer.h
+++ b/core/audio/mixer/mixer.h
@@ -47,7 +47,7 @@ private:
     void update_taskflow(uint32_t in_frames);
 
     std::vector<mixer_track*> tracks_;
-    std::map<int32_t, std::vector<mixer_track*>> layer_tracks_;
+    std::unordered_map<int32_t, std::vector<mixer_track*>> layer_tracks_;
     std::vector<int32_t> layer_order_;
     std::atomic<tf::Executor*> executor_;
     tf::Taskflow taskflow_;
diff --git a/core/audio/plugin_host/midi_sequencer.cpp b/core/audio/plugin_host/midi_sequencer.cpp
index 5d2cae5..01aa625 100644
--- a/core/audio/plugin_host/midi_sequencer.cpp
+++ b/core/audio/plugin_host/midi_sequencer.cpp
@@ -1,15 +1,44 @@
 #include "midi_sequencer.h"
 
+#include "audio/device/audio_device_manager.h"
+#include "misc/tick.h"
 #include "vst2/vst2_plugin_host.h"
 
 IMPL_SINGLETON_INSTANCE(midi_sequencer)
 
+
 void midi_sequencer::init(singleton_initliazer& initliazer) {
     singleton_t<midi_sequencer>::init(initliazer);
-
-    vst2_plugin_host::vst_time_info.tempo = 128.0;
-
+    auto adm = initliazer.require<audio_device_manager>();
+    adm->on_sample_rate_changed.add_raw(this, &midi_sequencer::on_sample_rate_changed);
+    set_bpm(140.0);
+    set_tpq(960);
 }
 
-void midi_sequencer::process(double sample_rate, uint32_t in_frames) {
+void midi_sequencer::process(double sample_rate, uint32_t delta_frames) {
+    update_time(sample_rate, delta_frames);
+    update_vst2_time_info();
 }
+
+void midi_sequencer::set_bpm(double in_bpm) {
+    bpm_ = std::max(in_bpm, 1.0);
+    vst2_time.tempo = bpm_;
+}
+
+void midi_sequencer::set_tpq(int32_t in_tpq) {
+    tpq_ = in_tpq;
+}
+
+void midi_sequencer::on_sample_rate_changed(uint32_t sample_rate) {
+    vst2_time.sampleRate = sample_rate;
+}
+
+void midi_sequencer::update_time(double sample_rate, uint32_t delta_frames) {
+    audio_frame frame(delta_frames);
+}
+
+void midi_sequencer::update_vst2_time_info() {
+    vst2_time.nanoSeconds = 0;
+    vst2_time.ppqPos = tpq_pos_;
+}
+
diff --git a/core/audio/plugin_host/midi_sequencer.h b/core/audio/plugin_host/midi_sequencer.h
index 6e6f391..85e3593 100644
--- a/core/audio/plugin_host/midi_sequencer.h
+++ b/core/audio/plugin_host/midi_sequencer.h
@@ -1,14 +1,35 @@
 #pragma once
 #include <cstdint>
 
+#include "misc/tick.h"
 #include "misc/singleton/singleton.h"
 
 class midi_sequencer : public singleton_t<midi_sequencer> {
 public:
+
     void init(singleton_initliazer& initliazer) override;
-    void process(double sample_rate, uint32_t in_frames);
+    void process(double sample_rate, uint32_t delta_frames);
 
     const char* get_name() override { return "midi_sequencer"; }
+    void set_bpm(double in_bpm);
+    void set_tpq(int32_t in_tpq);
+    [[nodiscard]] double get_bpm() const {
+        return bpm_;
+    }
+    [[nodiscard]] int32_t get_tpq() const {
+        return tpq_;
+    }
+protected:
+    void on_sample_rate_changed(uint32_t sample_rate);
+    void update_time(double sample_rate, uint32_t delta_frames);
+private:
+    void update_vst2_time_info();
+
+    double bpm_ = 0;
+    int32_t tpq_ = 0;
+    audio_frame sample_pos_ = 0;
+    int32_t tpq_pos_ = 0;
+    double nano_seconds_ = 0;
 };
 
 DEFINE_SINGLETON_INSTANCE(midi_sequencer)
diff --git a/core/audio/plugin_host/plugin_host_manager.cpp b/core/audio/plugin_host/plugin_host_manager.cpp
index 35ca39b..580f7a6 100644
--- a/core/audio/plugin_host/plugin_host_manager.cpp
+++ b/core/audio/plugin_host/plugin_host_manager.cpp
@@ -116,6 +116,7 @@ void plugin_host_manager::update_taskflow(uint32_t in_frames) {
 
 void plugin_host_manager::begin_release(singleton_release_guard& release_guard) {
     auto executor = executor_.exchange(nullptr);
-    executor->wait_for_all();
+    if (executor)
+        executor->wait_for_all();
     delete executor;
 }
diff --git a/core/audio/plugin_host/vst2/vst2_plugin_host.cpp b/core/audio/plugin_host/vst2/vst2_plugin_host.cpp
index 198d045..7c45521 100644
--- a/core/audio/plugin_host/vst2/vst2_plugin_host.cpp
+++ b/core/audio/plugin_host/vst2/vst2_plugin_host.cpp
@@ -4,10 +4,10 @@
 #include "audio/mixer/channel_interface.h"
 #include "window/window_manager.h"
 
-std::map<std::string, std::weak_ptr<dynamic_library>> vst2_library_map;
+std::unordered_map<std::string, std::weak_ptr<dynamic_library>> vst2_library_map;
 VstTimeInfo vst2_plugin_host::vst_time_info{};
 
-std::map<std::string, bool> can_do_map =
+std::unordered_map<std::string, bool> can_do_map =
 {
     {"sendVstEvents", true},
     {"sendVstMidiEvent", true},
@@ -73,7 +73,7 @@ VstIntPtr vst_master_callback(AEffect* effect, VstInt32 opcode, VstInt32 index,
             return 1;
         }
         case audioMasterGetTime:
-            return (VstIntPtr)&vst2_plugin_host::vst_time_info;
+            return (VstIntPtr)&vst2_time;
         case audioMasterIdle:
             // UE_LOG(LogTemp, Log, TEXT("Plugin Idle"));
         return 1;
diff --git a/core/audio/plugin_host/vst2/vst2_plugin_host.h b/core/audio/plugin_host/vst2/vst2_plugin_host.h
index 5725e20..89b1184 100644
--- a/core/audio/plugin_host/vst2/vst2_plugin_host.h
+++ b/core/audio/plugin_host/vst2/vst2_plugin_host.h
@@ -43,3 +43,5 @@ private:
     std::shared_ptr<dynamic_library> library_;
     bool enabled_ = false;
 };
+
+#define vst2_time vst2_plugin_host::vst_time_info
diff --git a/core/misc/singleton/singleton.h b/core/misc/singleton/singleton.h
index c7ca432..ab70213 100644
--- a/core/misc/singleton/singleton.h
+++ b/core/misc/singleton/singleton.h
@@ -46,7 +46,7 @@ public:
     #define DEFINE_SINGLETON_INSTANCE(T) \
         inline T g_##T; \
         extern "C" CORE_API T* get_##T();
-    #else
+#else
     #define DEFINE_SINGLETON_INSTANCE(T) \
         extern "C" CORE_API T* get_##T();
 #endif
diff --git a/core/misc/tick.cpp b/core/misc/tick.cpp
new file mode 100644
index 0000000..6ad56f7
--- /dev/null
+++ b/core/misc/tick.cpp
@@ -0,0 +1,29 @@
+#include "tick.h"
+#include "audio/device/audio_device_manager.h"
+#include "audio/plugin_host/midi_sequencer.h"
+
+midi_tick::midi_tick(const audio_frame& in_frame) {
+    auto bpm = g_midi_sequencer.get_bpm();
+    auto tpq = g_midi_sequencer.get_tpq();
+    auto sample_rate = g_audio_device_manager.get_sample_rate();
+
+    double time_in_seconds = (double)in_frame.get_frames() / sample_rate;
+    ticks = time_in_seconds * bpm * tpq / 60.0;
+}
+
+audio_frame midi_tick::to_audio_frame() const {
+    return audio_frame(*this);
+}
+
+audio_frame::audio_frame(const midi_tick& in_tick) {
+    auto bpm = g_midi_sequencer.get_bpm();
+    auto tpq = g_midi_sequencer.get_tpq();
+    auto sample_rate = g_audio_device_manager.get_sample_rate();
+    double tick_duration = 60.0 / (bpm * tpq);
+    double tick_in_seconds = in_tick.get_ticks() * tick_duration;
+    frames = tick_in_seconds * sample_rate;
+}
+
+midi_tick audio_frame::to_midi_tick() const {
+    return midi_tick(*this);
+}
diff --git a/core/misc/tick.h b/core/misc/tick.h
new file mode 100644
index 0000000..950d35f
--- /dev/null
+++ b/core/misc/tick.h
@@ -0,0 +1,42 @@
+#pragma once
+
+#include <cstdint>
+
+class audio_frame;
+
+class midi_tick {
+public:
+    midi_tick(int64_t in_ticks) : ticks(in_ticks) {
+
+    }
+    explicit midi_tick(const audio_frame& in_frame);
+
+    [[nodiscard]] audio_frame to_audio_frame() const;
+    [[nodiscard]] int64_t get_ticks() const {
+        return ticks;
+    }
+    operator int64_t() const {
+        return ticks;
+    }
+private:
+    int64_t ticks;
+};
+
+class audio_frame {
+public:
+    audio_frame(int64_t in_frames) : frames(in_frames) {
+
+    }
+    explicit audio_frame(const midi_tick& in_tick);
+
+    [[nodiscard]] midi_tick to_midi_tick() const;
+    [[nodiscard]] int64_t get_frames() const {
+        return frames;
+    }
+    operator int64_t() const {
+        return frames;
+    }
+    auto operator<=>(const audio_frame&) const = default;
+private:
+    int64_t frames;
+};
\ No newline at end of file
diff --git a/core/window/window_manager.h b/core/window/window_manager.h
index a470152..ba7a3ca 100644
--- a/core/window/window_manager.h
+++ b/core/window/window_manager.h
@@ -1,7 +1,7 @@
 #pragma once
 #include "GLFW/glfw3.h"
 #include "misc/singleton/singleton.h"
-#include <map>
+#include <unordered_map>
 #include <memory>
 #include <thread>
 
@@ -27,7 +27,7 @@ private:
         std::shared_ptr<GLFWwindow> window;
     };
     void on_host_window_close(GLFWwindow* window);
-    std::map<plugin_host*, host_info> host_infos_;
+    std::unordered_map<plugin_host*, host_info> host_infos_;
 };
 
 DEFINE_SINGLETON_INSTANCE(window_manager)
\ No newline at end of file