diff --git a/extern/audaspace/bindings/C/AUD_Sequence.cpp b/extern/audaspace/bindings/C/AUD_Sequence.cpp
index e3f88629657..ae887c381aa 100644
--- a/extern/audaspace/bindings/C/AUD_Sequence.cpp
+++ b/extern/audaspace/bindings/C/AUD_Sequence.cpp
@@ -165,6 +165,12 @@ AUD_API void AUD_SequenceEntry_move(AUD_SequenceEntry* entry, double begin, doub
 	(*entry)->move(begin, end, skip);
 }
 
+AUD_API void AUD_SequenceEntry_setAnimationData_constant_range(AUD_SequenceEntry* entry, AUD_AnimateablePropertyType type, int frame_start, int frame_end, float* data)
+{
+  AnimateableProperty* prop = (*entry)->getAnimProperty(static_cast<AnimateablePropertyType>(type));
+  prop->write_range(data, frame_start, frame_end);
+}
+
 AUD_API void AUD_SequenceEntry_setAnimationData(AUD_SequenceEntry* entry, AUD_AnimateablePropertyType type, int frame, float* data, char animated)
 {
 	AnimateableProperty* prop = (*entry)->getAnimProperty(static_cast<AnimateablePropertyType>(type));
diff --git a/extern/audaspace/bindings/C/AUD_Sequence.h b/extern/audaspace/bindings/C/AUD_Sequence.h
index bdf1a61a2de..11b9206e5cb 100644
--- a/extern/audaspace/bindings/C/AUD_Sequence.h
+++ b/extern/audaspace/bindings/C/AUD_Sequence.h
@@ -68,6 +68,16 @@ extern AUD_API void AUD_Sequence_remove(AUD_Sound* sequence, AUD_SequenceEntry*
  * Writes animation data to a sequence.
  * \param sequence The sound scene.
  * \param type The type of animation data.
+ * \param frame_start Start of the frame range.
+ * \param frame_end End of the frame range.
+ * \param data The data to write.
+ */
+AUD_API void AUD_SequenceEntry_setAnimationData_constant_range(AUD_SequenceEntry* entry, AUD_AnimateablePropertyType type, int frame_start, int frame_end, float* data);
+
+/**
+ * Writes animation data to a sequenced entry.
+ * \param entry The sequenced entry.
+ * \param type The type of animation data.
  * \param frame The frame this data is for.
  * \param data The data to write.
  * \param animated Whether the attribute is animated.
diff --git a/extern/audaspace/include/sequence/AnimateableProperty.h b/extern/audaspace/include/sequence/AnimateableProperty.h
index 2c3fcf23f8b..3bd574781fc 100644
--- a/extern/audaspace/include/sequence/AnimateableProperty.h
+++ b/extern/audaspace/include/sequence/AnimateableProperty.h
@@ -112,6 +112,14 @@ public:
 	 */
 	void write(const float* data, int position, int count);
 
+  /**
+   * Fills the properties frame range with constant value and marks it animated.
+   * \param data The new value.
+   * \param position_start The start position in the animation in frames.
+   * \param position_end The end position in the animation in frames.
+   */
+  void write_range(const float* data, int position_start, int position_end);
+
 	/**
 	 * Reads the properties value.
 	 * \param position The position in the animation in frames.
diff --git a/extern/audaspace/include/sequence/SequenceEntry.h b/extern/audaspace/include/sequence/SequenceEntry.h
index b8e9f116ee4..5146a4b4b68 100644
--- a/extern/audaspace/include/sequence/SequenceEntry.h
+++ b/extern/audaspace/include/sequence/SequenceEntry.h
@@ -63,6 +63,9 @@ private:
 	/// How many seconds are skipped at the beginning.
 	double m_skip;
 
+  /// The FPS of the scene.
+  float m_fps;
+
 	/// Whether the entry is muted.
 	bool m_muted;
 
@@ -124,7 +127,7 @@ public:
 	 * \param skip How much seconds should be skipped at the beginning.
 	 * \param id The ID of the entry.
 	 */
-	SequenceEntry(std::shared_ptr<ISound> sound, double begin, double end, double skip, int id);
+	SequenceEntry(std::shared_ptr<ISound> sound, double begin, double end, double skip, float fps, int id);
 	virtual ~SequenceEntry();
 
 	/**
diff --git a/extern/audaspace/src/sequence/AnimateableProperty.cpp b/extern/audaspace/src/sequence/AnimateableProperty.cpp
index 306ba8e07f5..fffc27aa346 100644
--- a/extern/audaspace/src/sequence/AnimateableProperty.cpp
+++ b/extern/audaspace/src/sequence/AnimateableProperty.cpp
@@ -65,6 +65,19 @@ void AnimateableProperty::write(const float* data)
 	std::memcpy(getBuffer(), data, m_count * sizeof(float));
 }
 
+void AnimateableProperty::write_range(const float* data, int position_start, int position_end)
+{
+  assureSize(position_end * m_count * sizeof(float), true);
+  float* buf = getBuffer();
+
+  for(int i = position_start; i < position_end; i++)
+  {
+    std::memcpy(buf + i * m_count, data, m_count * sizeof(float));
+  }
+  m_isAnimated = true;
+}
+
+
 void AnimateableProperty::write(const float* data, int position, int count)
 {
 	std::lock_guard<std::recursive_mutex> lock(m_mutex);
diff --git a/extern/audaspace/src/sequence/SequenceData.cpp b/extern/audaspace/src/sequence/SequenceData.cpp
index 288f0bd225d..d569df40878 100644
--- a/extern/audaspace/src/sequence/SequenceData.cpp
+++ b/extern/audaspace/src/sequence/SequenceData.cpp
@@ -153,7 +153,7 @@ std::shared_ptr<SequenceEntry> SequenceData::add(std::shared_ptr<ISound> sound,
 {
 	std::lock_guard<std::recursive_mutex> lock(m_mutex);
 
-	std::shared_ptr<SequenceEntry> entry = std::shared_ptr<SequenceEntry>(new SequenceEntry(sound, begin, end, skip, m_id++));
+	std::shared_ptr<SequenceEntry> entry = std::shared_ptr<SequenceEntry>(new SequenceEntry(sound, begin, end, skip, m_fps, m_id++));
 
 	m_entries.push_back(entry);
 	m_entry_status++;
diff --git a/extern/audaspace/src/sequence/SequenceEntry.cpp b/extern/audaspace/src/sequence/SequenceEntry.cpp
index b63bdd2ffca..6c25eeb2e7b 100644
--- a/extern/audaspace/src/sequence/SequenceEntry.cpp
+++ b/extern/audaspace/src/sequence/SequenceEntry.cpp
@@ -22,7 +22,7 @@
 
 AUD_NAMESPACE_BEGIN
 
-SequenceEntry::SequenceEntry(std::shared_ptr<ISound> sound, double begin, double end, double skip, int id) :
+SequenceEntry::SequenceEntry(std::shared_ptr<ISound> sound, double begin, double end, double skip, float fps, int id) :
 	m_status(0),
 	m_pos_status(1),
 	m_sound_status(0),
@@ -31,6 +31,7 @@ SequenceEntry::SequenceEntry(std::shared_ptr<ISound> sound, double begin, double
 	m_begin(begin),
 	m_end(end),
 	m_skip(skip),
+	m_fps(fps),
 	m_muted(false),
 	m_relative(true),
 	m_volume_max(1.0f),
diff --git a/extern/audaspace/src/sequence/SequenceHandle.cpp b/extern/audaspace/src/sequence/SequenceHandle.cpp
index fca4e805df2..8c6e06f7c74 100644
--- a/extern/audaspace/src/sequence/SequenceHandle.cpp
+++ b/extern/audaspace/src/sequence/SequenceHandle.cpp
@@ -241,10 +241,30 @@ bool SequenceHandle::seek(double position)
 		return false;
 
 	std::lock_guard<ILockable> lock(*m_entry);
-	double seekpos = position - m_entry->m_begin;
-	if(seekpos < 0)
-		seekpos = 0;
-	seekpos += m_entry->m_skip;
+	float seek_frame = (position - m_entry->m_begin) * m_entry->m_fps;
+	if(seek_frame < 0)
+		seek_frame = 0;
+	seek_frame += m_entry->m_skip * m_entry->m_fps;
+
+	AnimateableProperty* pitch_property = m_entry->getAnimProperty(AP_PITCH);
+
+	float target_frame = 0;
+	if(pitch_property != nullptr)
+	{
+		for(int i = 0; i < seek_frame; i++)
+		{
+			float pitch;
+			pitch_property->read(i, &pitch);
+			target_frame += pitch;
+		}
+	}
+	else
+	{
+		target_frame = seek_frame;
+	}
+
+	double seekpos = target_frame / m_entry->m_fps;
+	
 	m_handle->setPitch(1.0f);
 	m_handle->seek(seekpos);
 
diff --git a/source/blender/blenkernel/BKE_sound.h b/source/blender/blenkernel/BKE_sound.h
index f0bb530e32b..e644a0f93cc 100644
--- a/source/blender/blenkernel/BKE_sound.h
+++ b/source/blender/blenkernel/BKE_sound.h
@@ -154,6 +154,11 @@ void BKE_sound_set_scene_sound_volume(void *handle, float volume, char animated)
 
 void BKE_sound_set_scene_sound_pitch(void *handle, float pitch, char animated);
 
+void BKE_sound_set_scene_sound_pitch_constant_range(void *handle,
+                                                    int frame_start,
+                                                    int frame_end,
+                                                    float pitch);
+
 void BKE_sound_set_scene_sound_pan(void *handle, float pan, char animated);
 
 void BKE_sound_update_sequencer(struct Main *main, struct bSound *sound);
diff --git a/source/blender/blenkernel/intern/sound.c b/source/blender/blenkernel/intern/sound.c
index f6fab916426..618ef7b267b 100644
--- a/source/blender/blenkernel/intern/sound.c
+++ b/source/blender/blenkernel/intern/sound.c
@@ -819,6 +819,15 @@ void BKE_sound_set_scene_sound_pitch(void *handle, float pitch, char animated)
   AUD_SequenceEntry_setAnimationData(handle, AUD_AP_PITCH, sound_cfra, &pitch, animated);
 }
 
+void BKE_sound_set_scene_sound_pitch_constant_range(void *handle,
+                                                    int frame_start,
+                                                    int frame_end,
+                                                    float pitch)
+{
+  AUD_SequenceEntry_setAnimationData_constant_range(
+      handle, AUD_AP_PITCH, frame_start, frame_end, &pitch);
+}
+
 void BKE_sound_set_scene_sound_pan(void *handle, float pan, char animated)
 {
   AUD_SequenceEntry_setAnimationData(handle, AUD_AP_PANNING, sound_cfra, &pan, animated);
diff --git a/source/blender/editors/space_sequencer/sequencer_draw.c b/source/blender/editors/space_sequencer/sequencer_draw.c
index 5d74ca96613..82de76ed941 100644
--- a/source/blender/editors/space_sequencer/sequencer_draw.c
+++ b/source/blender/editors/space_sequencer/sequencer_draw.c
@@ -413,7 +413,6 @@ static void draw_seq_waveform_overlay(
 
   const float frames_per_pixel = BLI_rctf_size_x(&region->v2d.cur) / region->winx;
   const float samples_per_frame = SOUND_WAVE_SAMPLES_PER_SECOND / FPS;
-  float samples_per_pixel = samples_per_frame * frames_per_pixel;
 
   /* Align strip start with nearest pixel to prevent waveform flickering. */
   const float x1_aligned = align_frame_with_pixel(x1, frames_per_pixel);
@@ -439,15 +438,17 @@ static void draw_seq_waveform_overlay(
   size_t wave_data_len = 0;
 
   /* Offset must be also aligned, otherwise waveform flickers when moving left handle. */
-  const float strip_offset = align_frame_with_pixel(seq->startofs + seq->anim_startofs,
-                                                    frames_per_pixel);
-  float start_sample = strip_offset * samples_per_frame;
-  start_sample += seq->sound->offset_time * SOUND_WAVE_SAMPLES_PER_SECOND;
+  float start_frame = SEQ_time_left_handle_frame_get(scene, seq);
+
   /* Add off-screen part of strip to offset. */
-  start_sample += (frame_start - x1_aligned) * samples_per_frame;
+  start_frame += (frame_start - x1_aligned);
+  start_frame += seq->sound->offset_time / FPS;
 
   for (int i = 0; i < pixels_to_draw; i++) {
-    float sample = start_sample + i * samples_per_pixel;
+    float timeline_frame = start_frame + i * frames_per_pixel;
+    /* TODO: Use linear interpolation between frames to avoid bad drawing quality. */
+    float frame_index = SEQ_give_frame_index(scene, seq, timeline_frame);
+    float sample = frame_index * samples_per_frame;
     int sample_index = round_fl_to_int(sample);
 
     if (sample_index < 0) {
@@ -468,6 +469,8 @@ static void draw_seq_waveform_overlay(
       value_min = (1.0f - f) * value_min + f * waveform->data[sample_index * 3 + 3];
       value_max = (1.0f - f) * value_max + f * waveform->data[sample_index * 3 + 4];
       rms = (1.0f - f) * rms + f * waveform->data[sample_index * 3 + 5];
+
+      float samples_per_pixel = samples_per_frame * frames_per_pixel;
       if (samples_per_pixel > 1.0f) {
         /* We need to sum up the values we skip over until the next step. */
         float next_pos = sample + samples_per_pixel;
diff --git a/source/blender/sequencer/SEQ_retiming.h b/source/blender/sequencer/SEQ_retiming.h
index 84254fda0ea..2b49b4eac06 100644
--- a/source/blender/sequencer/SEQ_retiming.h
+++ b/source/blender/sequencer/SEQ_retiming.h
@@ -38,6 +38,9 @@ float SEQ_retiming_handle_speed_get(const struct Scene *scene,
                                     const struct SeqRetimingHandle *handle);
 int SEQ_retiming_handle_index_get(const struct Sequence *seq,
                                   const struct SeqRetimingHandle *handle);
+int SEQ_retiming_handle_index_get(const struct Sequence *seq,
+                                  const struct SeqRetimingHandle *handle);
+void SEQ_retiming_sound_animation_data_set(const struct Scene *scene, const struct Sequence *seq);
 #ifdef __cplusplus
 }
 #endif
diff --git a/source/blender/sequencer/SEQ_time.h b/source/blender/sequencer/SEQ_time.h
index 45ec3bbc8ae..e547699c33b 100644
--- a/source/blender/sequencer/SEQ_time.h
+++ b/source/blender/sequencer/SEQ_time.h
@@ -73,6 +73,8 @@ int SEQ_time_find_next_prev_edit(struct Scene *scene,
 bool SEQ_time_strip_intersects_frame(const struct Scene *scene,
                                      const struct Sequence *seq,
                                      int timeline_frame);
+/* Convert timeline frame so strip frame index. */
+float SEQ_give_frame_index(const struct Scene *scene, struct Sequence *seq, float timeline_frame);
 /**
  * Returns true if strip has frames without content to render.
  */
diff --git a/source/blender/sequencer/intern/effects.c b/source/blender/sequencer/intern/effects.c
index 3e3fe85ed39..cd0c4dc6203 100644
--- a/source/blender/sequencer/intern/effects.c
+++ b/source/blender/sequencer/intern/effects.c
@@ -2620,7 +2620,7 @@ float seq_speed_effect_target_frame_get(Scene *scene,
   }
 
   SEQ_effect_handle_get(seq_speed); /* Ensure, that data are initialized. */
-  int frame_index = seq_give_frame_index(scene, seq_speed, timeline_frame);
+  int frame_index = SEQ_give_frame_index(scene, seq_speed, timeline_frame);
   SpeedControlVars *s = (SpeedControlVars *)seq_speed->effectdata;
   const Sequence *source = seq_speed->seq1;
 
diff --git a/source/blender/sequencer/intern/image_cache.c b/source/blender/sequencer/intern/image_cache.c
index 21ce2cbdf9a..a49b2c07a5f 100644
--- a/source/blender/sequencer/intern/image_cache.c
+++ b/source/blender/sequencer/intern/image_cache.c
@@ -142,7 +142,7 @@ static float seq_cache_timeline_frame_to_frame_index(Scene *scene,
    * images or extended frame range of movies will only generate one cache entry. No special
    * treatment in converting frame index to timeline_frame is needed. */
   if (ELEM(type, SEQ_CACHE_STORE_RAW, SEQ_CACHE_STORE_THUMBNAIL)) {
-    return seq_give_frame_index(scene, seq, timeline_frame);
+    return SEQ_give_frame_index(scene, seq, timeline_frame);
   }
 
   return timeline_frame - SEQ_time_start_frame_get(seq);
diff --git a/source/blender/sequencer/intern/proxy.c b/source/blender/sequencer/intern/proxy.c
index eaea310f423..33b49ddd436 100644
--- a/source/blender/sequencer/intern/proxy.c
+++ b/source/blender/sequencer/intern/proxy.c
@@ -209,7 +209,7 @@ ImBuf *seq_proxy_fetch(const SeqRenderData *context, Sequence *seq, int timeline
   }
 
   if (proxy->storage & SEQ_STORAGE_PROXY_CUSTOM_FILE) {
-    int frameno = (int)seq_give_frame_index(context->scene, seq, timeline_frame) +
+    int frameno = (int)SEQ_give_frame_index(context->scene, seq, timeline_frame) +
                   seq->anim_startofs;
     if (proxy->anim == NULL) {
       if (seq_proxy_get_fname(
diff --git a/source/blender/sequencer/intern/render.c b/source/blender/sequencer/intern/render.c
index 65ba8bf48fe..f9b94cf2fc2 100644
--- a/source/blender/sequencer/intern/render.c
+++ b/source/blender/sequencer/intern/render.c
@@ -238,7 +238,7 @@ StripElem *SEQ_render_give_stripelem(const Scene *scene, Sequence *seq, int time
      * all other strips don't use this...
      */
 
-    int frame_index = (int)seq_give_frame_index(scene, seq, timeline_frame);
+    int frame_index = (int)SEQ_give_frame_index(scene, seq, timeline_frame);
 
     if (frame_index == -1 || se == NULL) {
       return NULL;
@@ -1042,7 +1042,7 @@ static ImBuf *seq_render_movie_strip_custom_file_proxy(const SeqRenderData *cont
     }
   }
 
-  int frameno = (int)seq_give_frame_index(context->scene, seq, timeline_frame) +
+  int frameno = (int)SEQ_give_frame_index(context->scene, seq, timeline_frame) +
                 seq->anim_startofs;
   return IMB_anim_absolute(proxy->anim, frameno, IMB_TC_NONE, IMB_PROXY_NONE);
 }
@@ -1658,7 +1658,7 @@ static ImBuf *do_render_strip_uncached(const SeqRenderData *context,
                                        bool *r_is_proxy_image)
 {
   ImBuf *ibuf = NULL;
-  float frame_index = seq_give_frame_index(context->scene, seq, timeline_frame);
+  float frame_index = SEQ_give_frame_index(context->scene, seq, timeline_frame);
   int type = (seq->type & SEQ_TYPE_EFFECT) ? SEQ_TYPE_EFFECT : seq->type;
   switch (type) {
     case SEQ_TYPE_META: {
diff --git a/source/blender/sequencer/intern/sequencer.c b/source/blender/sequencer/intern/sequencer.c
index 58c791ad63d..1d79368687b 100644
--- a/source/blender/sequencer/intern/sequencer.c
+++ b/source/blender/sequencer/intern/sequencer.c
@@ -990,9 +990,7 @@ static bool seq_update_seq_cb(Sequence *seq, void *user_data)
     }
     BKE_sound_set_scene_sound_volume(
         seq->scene_sound, seq->volume, (seq->flag & SEQ_AUDIO_VOLUME_ANIMATED) != 0);
-    BKE_sound_set_scene_sound_pitch(seq->scene_sound,
-                                    SEQ_sound_pitch_get(scene, seq),
-                                    (seq->flag & SEQ_AUDIO_PITCH_ANIMATED) != 0);
+    SEQ_retiming_sound_animation_data_set(scene, seq);
     BKE_sound_set_scene_sound_pan(
         seq->scene_sound, seq->pan, (seq->flag & SEQ_AUDIO_PAN_ANIMATED) != 0);
   }
diff --git a/source/blender/sequencer/intern/strip_add.c b/source/blender/sequencer/intern/strip_add.c
index 7744bc4ce1c..c445123f3fc 100644
--- a/source/blender/sequencer/intern/strip_add.c
+++ b/source/blender/sequencer/intern/strip_add.c
@@ -433,6 +433,7 @@ Sequence *SEQ_add_movie_strip(Main *bmain, Scene *scene, ListBase *seqbase, SeqL
     if (load_data->flags & SEQ_LOAD_MOVIE_SYNC_FPS) {
       scene->r.frs_sec = fps_denom;
       scene->r.frs_sec_base = fps_num;
+      DEG_id_tag_update(&scene->id, ID_RECALC_AUDIO_FPS | ID_RECALC_SEQUENCER_STRIPS);
     }
 
     load_data->r_video_stream_start = IMD_anim_get_offset(anim_arr[0]);
diff --git a/source/blender/sequencer/intern/strip_retiming.cc b/source/blender/sequencer/intern/strip_retiming.cc
index b3da8ad3f47..e6cbb2fba26 100644
--- a/source/blender/sequencer/intern/strip_retiming.cc
+++ b/source/blender/sequencer/intern/strip_retiming.cc
@@ -118,6 +118,7 @@ bool SEQ_retiming_is_active(const Sequence *seq)
 bool SEQ_retiming_is_allowed(const Sequence *seq)
 {
   return ELEM(seq->type,
+              SEQ_TYPE_SOUND_RAM,
               SEQ_TYPE_IMAGE,
               SEQ_TYPE_META,
               SEQ_TYPE_SCENE,
@@ -126,7 +127,7 @@ bool SEQ_retiming_is_allowed(const Sequence *seq)
               SEQ_TYPE_MASK);
 }
 
-float seq_retiming_evaluate(const Sequence *seq, const int frame_index)
+float seq_retiming_evaluate(const Sequence *seq, const float frame_index)
 {
   const SeqRetimingHandle *previous_handle = retiming_find_segment_start_handle(seq, frame_index);
   const SeqRetimingHandle *next_handle = previous_handle + 1;
@@ -140,7 +141,7 @@ float seq_retiming_evaluate(const Sequence *seq, const int frame_index)
   }
 
   const int segment_length = next_handle->strip_frame_index - previous_handle->strip_frame_index;
-  const int segment_frame_index = frame_index - previous_handle->strip_frame_index;
+  const float segment_frame_index = frame_index - previous_handle->strip_frame_index;
   const float segment_fac = segment_frame_index / (float)segment_length;
 
   const float target_diff = next_handle->retiming_factor - previous_handle->retiming_factor;
@@ -245,3 +246,131 @@ float SEQ_retiming_handle_speed_get(const Scene *scene,
   const float speed = (float)fragment_length_retimed / (float)fragment_length_original;
   return speed;
 }
+
+using std::vector;
+
+class RetimingRange {
+ public:
+  int start, end;
+  float speed;
+
+  enum eIntersectType {
+    FULL,
+    PARTIAL_START,
+    PARTIAL_END,
+    INSIDE,
+    NONE,
+  };
+
+  RetimingRange(int start_frame, int end_frame, float speed)
+      : start(start_frame), end(end_frame), speed(speed)
+  {
+  }
+
+  const eIntersectType intersect_type(const RetimingRange &other) const
+  {
+    if (other.start <= start && other.end >= end) {
+      return FULL;
+    }
+    if (other.start > start && other.start < end && other.end > start && other.end < end) {
+      return INSIDE;
+    }
+    if (other.start > start && other.start < end) {
+      return PARTIAL_END;
+    }
+    if (other.end > start && other.end < end) {
+      return PARTIAL_START;
+    }
+    return NONE;
+  }
+};
+
+class RetimingRangeData {
+ public:
+  vector<RetimingRange> ranges;
+  RetimingRangeData(const Scene *scene, const Sequence *seq)
+  {
+    MutableSpan handles = SEQ_retiming_handles_get(seq);
+    for (const SeqRetimingHandle &handle : handles) {
+      if (handle.strip_frame_index == 0) {
+        continue;
+      }
+      const SeqRetimingHandle *handle_prev = &handle - 1;
+      float speed = SEQ_retiming_handle_speed_get(scene, seq, &handle);
+      int frame_start = SEQ_time_start_frame_get(seq) + handle_prev->strip_frame_index;
+      int frame_end = SEQ_time_start_frame_get(seq) + handle.strip_frame_index;
+
+      RetimingRange range = RetimingRange(frame_start, frame_end, speed);
+      ranges.push_back(range);
+    }
+  }
+
+  RetimingRangeData &operator*=(const RetimingRangeData rhs)
+  {
+    if (ranges.size() == 0) {
+      for (const RetimingRange &rhs_range : rhs.ranges) {
+        RetimingRange range = RetimingRange(rhs_range.start, rhs_range.end, rhs_range.speed);
+        ranges.push_back(range);
+      }
+    }
+    else {
+      for (int i = 0; i < ranges.size(); i++) {
+        RetimingRange &range = ranges[i];
+        for (const RetimingRange &rhs_range : rhs.ranges) {
+          if (range.intersect_type(rhs_range) == range.NONE) {
+            continue;
+          }
+          else if (range.intersect_type(rhs_range) == range.FULL) {
+            range.speed *= rhs_range.speed;
+          }
+          else if (range.intersect_type(rhs_range) == range.PARTIAL_START) {
+            RetimingRange range_left = RetimingRange(
+                range.start, rhs_range.end, range.speed * rhs_range.speed);
+            range.start = rhs_range.end + 1;
+            ranges.insert(ranges.begin() + i, range_left);
+          }
+          else if (range.intersect_type(rhs_range) == range.PARTIAL_END) {
+            RetimingRange range_left = RetimingRange(
+                range.start, rhs_range.start - 1, range.speed);
+            range.start = rhs_range.start;
+            ranges.insert(ranges.begin() + i, range_left);
+          }
+          else if (range.intersect_type(rhs_range) == range.INSIDE) {
+            RetimingRange range_left = RetimingRange(
+                range.start, rhs_range.start - 1, range.speed);
+            RetimingRange range_mid = RetimingRange(
+                rhs_range.start, rhs_range.start, rhs_range.speed * range.speed);
+            range.start = rhs_range.end + 1;
+            ranges.insert(ranges.begin() + i, range_left);
+            ranges.insert(ranges.begin() + i, range_mid);
+            break;
+          }
+        }
+      }
+    }
+    return *this;
+  }
+};
+
+static RetimingRangeData seq_retiming_range_data_get(const Scene *scene, const Sequence *seq)
+{
+  RetimingRangeData strip_retiming_data = RetimingRangeData(scene, seq);
+
+  const Sequence *meta_parent = seq_sequence_lookup_meta_by_seq(scene, seq);
+  if (meta_parent == nullptr) {
+    return strip_retiming_data;
+  }
+
+  RetimingRangeData meta_retiming_data = RetimingRangeData(scene, meta_parent);
+  strip_retiming_data *= meta_retiming_data;
+  return strip_retiming_data;
+}
+
+void SEQ_retiming_sound_animation_data_set(const Scene *scene, const Sequence *seq)
+{
+  RetimingRangeData retiming_data = seq_retiming_range_data_get(scene, seq);
+  for (const RetimingRange &range : retiming_data.ranges) {
+    BKE_sound_set_scene_sound_pitch_constant_range(
+        seq->scene_sound, range.start, range.end, range.speed);
+  }
+}
diff --git a/source/blender/sequencer/intern/strip_time.c b/source/blender/sequencer/intern/strip_time.c
index bdefe04886f..2da670f49cd 100644
--- a/source/blender/sequencer/intern/strip_time.c
+++ b/source/blender/sequencer/intern/strip_time.c
@@ -62,7 +62,7 @@ int seq_time_strip_original_content_length_get(const Scene *scene, const Sequenc
   return seq->len / seq_time_media_playback_rate_factor_get(scene, seq);
 }
 
-float seq_give_frame_index(const Scene *scene, Sequence *seq, float timeline_frame)
+float SEQ_give_frame_index(const Scene *scene, Sequence *seq, float timeline_frame)
 {
   float frame_index;
   float sta = SEQ_time_start_frame_get(seq);
diff --git a/source/blender/sequencer/intern/strip_time.h b/source/blender/sequencer/intern/strip_time.h
index fbd35dc6adf..6b6c5b5adad 100644
--- a/source/blender/sequencer/intern/strip_time.h
+++ b/source/blender/sequencer/intern/strip_time.h
@@ -16,7 +16,6 @@ struct Scene;
 struct Sequence;
 struct SeqCollection;
 
-float seq_give_frame_index(const struct Scene *scene, struct Sequence *seq, float timeline_frame);
 void seq_update_sound_bounds_recursive(const struct Scene *scene, struct Sequence *metaseq);
 
 /* Describes gap between strips in timeline. */
@@ -45,7 +44,7 @@ float seq_time_media_playback_rate_factor_get(const struct Scene *scene,
                                               const struct Sequence *seq);
 int seq_time_strip_original_content_length_get(const struct Scene *scene,
                                                const struct Sequence *seq);
-float seq_retiming_evaluate(const struct Sequence *seq, const int frame_index);
+float seq_retiming_evaluate(const struct Sequence *seq, const float frame_index);
 
 #ifdef __cplusplus
 }