diff --git a/src/seamless_communication/streaming/agents/dual_vocoder_agent.py b/src/seamless_communication/streaming/agents/dual_vocoder_agent.py
new file mode 100644
index 00000000..d05a702c
--- /dev/null
+++ b/src/seamless_communication/streaming/agents/dual_vocoder_agent.py
@@ -0,0 +1,116 @@
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+# All rights reserved.
+#
+# This source code is licensed under the license found in the
+# LICENSE file in the root directory of this source tree.
+from __future__ import annotations
+import copy
+
+import logging
+from argparse import ArgumentParser, Namespace
+from typing import Dict, Any
+
+from simuleval.agents import TextToSpeechAgent
+from seamless_communication.streaming.agents.common import AgentStates
+from simuleval.data.segments import Segment
+from simuleval.agents.actions import Action
+
+from seamless_communication.streaming.agents.pretssel_vocoder import (
+    PretsselVocoderAgent,
+)
+from seamless_communication.streaming.agents.online_vocoder import VocoderAgent
+
+logging.basicConfig(
+    level=logging.INFO,
+    format="%(asctime)s %(levelname)s -- %(name)s: %(message)s",
+)
+
+logger = logging.getLogger(__name__)
+
+
+class DualVocoderStates(AgentStates):
+    def __init__(
+        self, vocoder_states: AgentStates, expr_vocoder_states: AgentStates
+    ) -> None:
+        self.vocoder_states = vocoder_states
+        self.expr_vocoder_states = expr_vocoder_states
+        self.config: Dict[str, Any] = {}
+
+    @property
+    def target_finished(self):  # type: ignore
+        return (
+            self.vocoder_states.target_finished
+            or self.expr_vocoder_states.target_finished
+        )
+
+    def reset(self) -> None:
+        self.vocoder_states.reset()
+        self.expr_vocoder_states.reset()
+        self.config = {}
+
+    def update_source(self, segment: Segment) -> None:
+        self.vocoder_states.update_config(segment.config)
+        self.vocoder_states.update_source(segment)
+        self.expr_vocoder_states.update_config(segment.config)
+        self.expr_vocoder_states.update_source(segment)
+
+    def update_target(self, segment: Segment) -> None:
+        self.vocoder_states.update_target(segment)
+        self.expr_vocoder_states.update_target(segment)
+
+
+class DualVocoderAgent(TextToSpeechAgent):  # type: ignore
+    def __init__(
+        self,
+        args: Namespace,
+        vocoder: VocoderAgent,
+        expr_vocoder: PretsselVocoderAgent,
+    ) -> None:
+        self.vocoder = vocoder
+        self.expr_vocoder = expr_vocoder
+        super().__init__(args)
+        self.expressive = args.expressive
+
+    def build_states(self) -> DualVocoderStates:
+        return DualVocoderStates(
+            self.vocoder.build_states(), self.expr_vocoder.build_states()
+        )
+
+    @classmethod
+    def add_args(cls, parser: ArgumentParser) -> None:
+        PretsselVocoderAgent.add_args(parser)
+        VocoderAgent.add_args(parser)
+        parser.add_argument(
+            "--expr-vocoder-name",
+            type=str,
+            required=True,
+            help="expressive vocoder name - vocoder_pretssel or vocoder_pretssel_16khz",
+        )
+        parser.add_argument(
+            "--expressive",
+            action="store_true",
+            help="Whether to use expressive vocoder (overridable in segment.config)",
+        )
+
+    @classmethod
+    def from_args(cls, args: Namespace, **kwargs: Dict[str, Any]) -> DualVocoderAgent:
+        vocoder = VocoderAgent.from_args(args)
+        expr_args = copy.deepcopy(args)
+        expr_args.vocoder_name = args.expr_vocoder_name
+        expr_vocoder = PretsselVocoderAgent.from_args(expr_args)
+        return cls(args, vocoder, expr_vocoder)
+
+    def policy(self, states: AgentStates) -> Action:
+        expressive = self.expressive
+        if states.config is not None and "expressive" in states.config:
+            expressive = states.config["expressive"]
+        if expressive:
+            states.expr_vocoder_states.upstream_states = states.upstream_states
+            action = self.expr_vocoder.policy(states.expr_vocoder_states)
+            if len(states.expr_vocoder_states.source) == 0:
+                states.vocoder_states.source = []
+        else:
+            action = self.vocoder.policy(states.vocoder_states)
+            if len(states.vocoder_states.source) == 0:
+                states.expr_vocoder_states.source = []
+        return action
diff --git a/src/seamless_communication/streaming/agents/online_unit_decoder.py b/src/seamless_communication/streaming/agents/online_unit_decoder.py
index a5195e01..ac96cf85 100644
--- a/src/seamless_communication/streaming/agents/online_unit_decoder.py
+++ b/src/seamless_communication/streaming/agents/online_unit_decoder.py
@@ -14,9 +14,9 @@
 from seamless_communication.streaming.agents.online_text_decoder import (
     UnitYTextDecoderOutput,
 )
+from seamless_communication.streaming.agents.common import AgentStates
 from simuleval.agents import GenericAgent
 from simuleval.agents.actions import Action, ReadAction, WriteAction
-from simuleval.agents.states import AgentStates
 from simuleval.data.segments import Segment, TextSegment
 
 
diff --git a/src/seamless_communication/streaming/agents/online_vocoder.py b/src/seamless_communication/streaming/agents/online_vocoder.py
index e943ae3e..2ca1ea93 100644
--- a/src/seamless_communication/streaming/agents/online_vocoder.py
+++ b/src/seamless_communication/streaming/agents/online_vocoder.py
@@ -11,7 +11,8 @@
 
 import torch
 from seamless_communication.models.vocoder.loader import load_vocoder_model
-from simuleval.agents import AgentStates, TextToSpeechAgent
+from seamless_communication.streaming.agents.common import AgentStates
+from simuleval.agents import TextToSpeechAgent
 from simuleval.agents.actions import ReadAction, WriteAction
 from simuleval.data.segments import SpeechSegment
 
diff --git a/src/seamless_communication/streaming/agents/pretssel_vocoder.py b/src/seamless_communication/streaming/agents/pretssel_vocoder.py
index 50912a47..b7945d34 100644
--- a/src/seamless_communication/streaming/agents/pretssel_vocoder.py
+++ b/src/seamless_communication/streaming/agents/pretssel_vocoder.py
@@ -16,8 +16,11 @@
 from seamless_communication.models.generator.loader import load_pretssel_vocoder_model
 from seamless_communication.models.unity import load_gcmvn_stats
 from seamless_communication.store import add_gated_assets
-from seamless_communication.streaming.agents.common import NoUpdateTargetMixin
-from simuleval.agents import AgentStates, TextToSpeechAgent
+from seamless_communication.streaming.agents.common import (
+    AgentStates,
+    NoUpdateTargetMixin,
+)
+from simuleval.agents import TextToSpeechAgent
 from simuleval.agents.actions import ReadAction, WriteAction
 from simuleval.data.segments import SpeechSegment
 
diff --git a/src/seamless_communication/streaming/agents/seamless_s2st.py b/src/seamless_communication/streaming/agents/seamless_s2st.py
index 7d756fd1..07932ea7 100644
--- a/src/seamless_communication/streaming/agents/seamless_s2st.py
+++ b/src/seamless_communication/streaming/agents/seamless_s2st.py
@@ -21,6 +21,9 @@
 from seamless_communication.streaming.agents.pretssel_vocoder import (
     PretsselVocoderAgent,
 )
+from seamless_communication.streaming.agents.dual_vocoder_agent import (
+    DualVocoderAgent,
+)
 from seamless_communication.streaming.agents.silero_vad import SileroVADAgent
 from seamless_communication.streaming.agents.unity_pipeline import (
     UnitYAgentPipeline,
@@ -48,3 +51,15 @@ class SeamlessS2STJointVADAgent(UnitYAgentTreePipeline):
         NARUnitYUnitDecoderAgent: [PretsselVocoderAgent],
         PretsselVocoderAgent: [],
     }
+
+
+class SeamlessS2STDualVocoderVADAgent(UnitYAgentTreePipeline):
+    pipeline = {
+        SileroVADAgent: [OnlineFeatureExtractorAgent],
+        OnlineFeatureExtractorAgent: [OfflineWav2VecBertEncoderAgent],
+        OfflineWav2VecBertEncoderAgent: [UnitYMMATextDecoderAgent],
+        UnitYMMATextDecoderAgent: [UnitYDetokenizerAgent, NARUnitYUnitDecoderAgent],
+        UnitYDetokenizerAgent: [],
+        NARUnitYUnitDecoderAgent: [DualVocoderAgent],
+        DualVocoderAgent: [],
+    }