diff --git a/api/src/structures/schemas.py b/api/src/structures/schemas.py
index 2608597..cc6858c 100644
--- a/api/src/structures/schemas.py
+++ b/api/src/structures/schemas.py
@@ -54,7 +54,7 @@ class OpenAISpeechRequest(BaseModel):
     )
     input: str = Field(..., description="The text to generate audio for")
     voice: str = Field(
-        default="af",
+        default="af_heart",
         description="The voice to use for generation. Can be a base voice or a combined voice name.",
     )
     response_format: Literal["mp3", "opus", "aac", "flac", "wav", "pcm"] = Field(
@@ -98,7 +98,7 @@ class CaptionedSpeechRequest(BaseModel):
     )
     input: str = Field(..., description="The text to generate audio for")
     voice: str = Field(
-        default="af",
+        default="af_heart",
         description="The voice to use for generation. Can be a base voice or a combined voice name.",
     )
     response_format: Literal["mp3", "opus", "aac", "flac", "wav", "pcm"] = Field(
diff --git a/examples/assorted_checks/benchmarks/benchmark_first_token.py b/examples/assorted_checks/benchmarks/benchmark_first_token.py
index a9e47bb..16f94c0 100644
--- a/examples/assorted_checks/benchmarks/benchmark_first_token.py
+++ b/examples/assorted_checks/benchmarks/benchmark_first_token.py
@@ -34,7 +34,7 @@ def measure_first_token(
             json={
                 "model": "kokoro",
                 "input": text,
-                "voice": "af",
+                "voice": "af_heart",
                 "response_format": "wav",
                 "stream": False,
             },
diff --git a/examples/assorted_checks/benchmarks/benchmark_first_token_stream_unified.py b/examples/assorted_checks/benchmarks/benchmark_first_token_stream_unified.py
index df1855c..c3b6d92 100644
--- a/examples/assorted_checks/benchmarks/benchmark_first_token_stream_unified.py
+++ b/examples/assorted_checks/benchmarks/benchmark_first_token_stream_unified.py
@@ -34,7 +34,7 @@ def measure_first_token_requests(
             json={
                 "model": "kokoro",
                 "input": text,
-                "voice": "af",
+                "voice": "af_heart",
                 "response_format": "pcm",
                 "stream": True,
             },
@@ -123,7 +123,7 @@ def measure_first_token_openai(
         # Make streaming request using OpenAI client
         with OPENAI_CLIENT.audio.speech.with_streaming_response.create(
             model="kokoro",
-            voice="af",
+            voice="af_heart",
             response_format="pcm",
             input=text,
         ) as response:
diff --git a/examples/assorted_checks/benchmarks/lib/shared_benchmark_utils.py b/examples/assorted_checks/benchmarks/lib/shared_benchmark_utils.py
index f44f7eb..4e9657e 100644
--- a/examples/assorted_checks/benchmarks/lib/shared_benchmark_utils.py
+++ b/examples/assorted_checks/benchmarks/lib/shared_benchmark_utils.py
@@ -56,7 +56,7 @@ def make_tts_request(
                 json={
                     "model": "kokoro",
                     "input": text,
-                    "voice": "af",
+                    "voice": "af_heart",
                     "response_format": "wav",
                     "stream": True,
                 },
@@ -77,7 +77,7 @@ def make_tts_request(
                 json={
                     "model": "kokoro",
                     "input": text,
-                    "voice": "af",
+                    "voice": "af_heart",
                     "response_format": "wav",
                     "stream": False,
                 },
diff --git a/examples/assorted_checks/test_formats/test_audio_formats.py b/examples/assorted_checks/test_formats/test_audio_formats.py
index 68156b6..efd527a 100644
--- a/examples/assorted_checks/test_formats/test_audio_formats.py
+++ b/examples/assorted_checks/test_formats/test_audio_formats.py
@@ -246,7 +246,7 @@ def main():
     output_dir.mkdir(exist_ok=True, parents=True)
 
     # First generate audio in each format using the API
-    voice = "af"  # Using default voice
+    voice = "af_heart"  # Using default voice
     formats = ["wav", "mp3", "opus", "flac", "pcm"]
     stats = []
 
diff --git a/examples/assorted_checks/test_openai/test_openai_tts.py b/examples/assorted_checks/test_openai/test_openai_tts.py
index 80e3602..01124af 100644
--- a/examples/assorted_checks/test_openai/test_openai_tts.py
+++ b/examples/assorted_checks/test_openai/test_openai_tts.py
@@ -23,7 +23,7 @@ def test_format(
 
     try:
         response = client.audio.speech.create(
-            model="tts-1", voice="af", input=text, response_format=format
+            model="tts-1", voice="af_heart", input=text, response_format=format
         )
 
         print("Got response, saving to file...")
@@ -43,7 +43,7 @@ def test_speed(speed: float):
     try:
         response = client.audio.speech.create(
             model="tts-1",
-            voice="af",
+            voice="af_heart",
             input="The quick brown fox jumped over the lazy dog.",
             response_format="wav",
             speed=speed,
diff --git a/ui/depr_tests/conftest.py b/ui/depr_tests/conftest.py
index 9b01e6b..f0c2a2e 100644
--- a/ui/depr_tests/conftest.py
+++ b/ui/depr_tests/conftest.py
@@ -16,7 +16,7 @@ async def mock_model_manager():
 async def mock_voice_manager():
     """Mock voice manager for UI tests"""
     manager = AsyncMock()
-    manager.list_voices = AsyncMock(return_value=["af", "bm_lewis", "af_sarah"])
+    manager.list_voices = AsyncMock(return_value=["af_heart", "bm_lewis", "af_sarah"])
     return manager