> ## Documentation Index > Fetch the complete documentation index at: https://docs.slng.ai/llms.txt > Use this file to discover all available pages before exploring further. # Orpheus (English) > Stream English speech synthesis from SLNG-hosted Canopy Labs Orpheus over WebSocket with emotion control and SLNG's unified low-latency TTS protocol. ## AsyncAPI ````yaml api-reference/asyncapi/tts-slng.asyncapi.yaml /v1/tts/slng/canopylabs/orpheus:en id: /v1/tts/slng/canopylabs/orpheus:en title: Orpheus (English) description: >- Stream English speech synthesis from SLNG-hosted Canopy Labs Orpheus over WebSocket with emotion control and SLNG's unified low-latency TTS protocol. servers: - id: production protocol: wss host: api.slng.ai bindings: [] variables: [] address: /v1/tts/slng/canopylabs/orpheus:en parameters: [] bindings: - protocol: ws version: latest value: method: GET headers: type: object properties: X-World-Part-Override: type: string description: >- Target world part override. Auto-selected if not provided. Available world parts: `eu`. enum: - eu x-parser-schema-id: x-parser-schema-id: WebsocketHeadersSlngOrpheus schemaProperties: - name: method type: string description: GET required: false - name: headers type: object required: false properties: - name: X-World-Part-Override type: string description: >- Target world part override. Auto-selected if not provided. Available world parts: `eu`. enumValues: - eu required: false operations: - &ref_1 id: ttsOrpheusEnReceiveInit title: Tts orpheus en receive init description: Initialize session on Orpheus (English) type: receive messages: - &ref_14 id: TtsInitRequest contentType: application/json payload: - name: Init Request description: Initialize a TTS session with model and voice configuration. type: object properties: - name: type type: string description: init required: true - name: model type: string description: TTS model identifier. enumValues: - aura:2 - eleven:3 - eleven-flash:2 - eleven-flash:2.5 - eleven-multilingual:2 - canopylabs/orpheus:en - deepgram/aura:2 - deepgram/aura:2-en - deepgram/aura:2-es - rime/arcana:3-en - rime/arcana:3-es - rime/arcana:3-hi - rime/arcana:ar - rime/arcana:de - rime/arcana:en - rime/arcana:es - rime/arcana:fr required: true - name: voice type: string description: Voice identifier required: false - name: config type: object description: Synthesis configuration options required: false properties: - name: sample_rate type: integer description: Audio sample rate in Hz. enumValues: - 8000 - 16000 - 22050 - 24000 - 32000 - 44100 - 48000 required: false - name: encoding type: string description: Audio encoding format enumValues: - linear16 - mp3 - opus required: false - name: language type: string description: ISO-639-1 language code. enumValues: - en - ja - zh - de - hi - fr - ko - pt - it - es - id - nl - tr - fil - pl - sv - bg - ro - ar - cs - el - fi - hr - ms - sk - da - ta - uk - ru - hu - 'no' - vi required: false - name: speed type: number description: Speech speed multiplier (e.g., 1.0 for normal) required: false headers: [] jsonPayloadSchema: type: object description: >- Initialize a session with model and voice configuration before sending text. required: - type - model properties: type: type: string const: init default: init x-parser-schema-id: model: type: string description: TTS model identifier. enum: - aura:2 - eleven:3 - eleven-flash:2 - eleven-flash:2.5 - eleven-multilingual:2 - canopylabs/orpheus:en - deepgram/aura:2 - deepgram/aura:2-en - deepgram/aura:2-es - rime/arcana:3-en - rime/arcana:3-es - rime/arcana:3-hi - rime/arcana:ar - rime/arcana:de - rime/arcana:en - rime/arcana:es - rime/arcana:fr x-parser-schema-id: TtsModel voice: type: string description: Voice identifier x-parser-schema-id: config: type: object description: Synthesis configuration options properties: sample_rate: type: integer description: Audio sample rate in Hz. enum: - 8000 - 16000 - 22050 - 24000 - 32000 - 44100 - 48000 x-parser-schema-id: SampleRate encoding: type: string description: Audio encoding format enum: - linear16 - mp3 - opus x-parser-schema-id: language: type: string description: ISO-639-1 language code. enum: - en - ja - zh - de - hi - fr - ko - pt - it - es - id - nl - tr - fil - pl - sv - bg - ro - ar - cs - el - fi - hr - ms - sk - da - ta - uk - ru - hu - 'no' - vi x-parser-schema-id: LanguageCode speed: type: number description: Speech speed multiplier (e.g., 1.0 for normal) x-parser-schema-id: x-parser-schema-id: x-parser-schema-id: title: Init Request description: Initialize a TTS session with model and voice configuration. example: |- { "type": "init", "model": "eleven-flash:2.5", "voice": "astra", "config": { "sample_rate": 24000, "encoding": "mp3" } } bindings: [] extensions: - id: x-parser-unique-object-id value: TtsInitRequest bindings: [] extensions: &ref_0 - id: x-parser-unique-object-id value: /v1/tts/slng/canopylabs/orpheus:en - &ref_2 id: ttsOrpheusEnReceiveText title: Tts orpheus en receive text description: Send text to Orpheus (English) type: receive messages: - &ref_15 id: TtsTextMessage contentType: application/json payload: - name: Text Message description: Send text to synthesize into audio output. type: object properties: - name: type type: string description: text required: true - name: text type: string description: Text to synthesize required: true - name: flush type: boolean description: Whether to flush remaining audio immediately after this text required: false headers: [] jsonPayloadSchema: type: object description: Send text to synthesize into audio output. required: - type - text properties: type: type: string const: text x-parser-schema-id: text: type: string description: Text to synthesize x-parser-schema-id: flush: type: boolean description: Whether to flush remaining audio immediately after this text x-parser-schema-id: x-parser-schema-id: title: Text Message description: Send text to synthesize into audio output. example: |- { "type": "text", "text": "Hello, this is a test of text-to-speech synthesis." } bindings: [] extensions: - id: x-parser-unique-object-id value: TtsTextMessage bindings: [] extensions: *ref_0 - &ref_3 id: ttsOrpheusEnReceiveFlush title: Tts orpheus en receive flush description: Flush buffered output on Orpheus (English) type: receive messages: - &ref_16 id: TtsFlushMessage contentType: application/json payload: - name: Flush Message description: Force any buffered text/audio to be finalized and delivered. type: object properties: - name: type type: string description: flush required: true headers: [] jsonPayloadSchema: type: object description: Force any buffered text/audio to be finalized and delivered. required: - type properties: type: type: string const: flush x-parser-schema-id: x-parser-schema-id: title: Flush Message description: Force any buffered text/audio to be finalized and delivered. example: |- { "type": "flush" } bindings: [] extensions: - id: x-parser-unique-object-id value: TtsFlushMessage bindings: [] extensions: *ref_0 - &ref_4 id: ttsOrpheusEnReceiveClear title: Tts orpheus en receive clear description: Clear queued output on Orpheus (English) type: receive messages: - &ref_17 id: TtsClearMessage contentType: application/json payload: - name: Clear Message description: Clear any queued text/audio from the current session. type: object properties: - name: type type: string description: clear required: true headers: [] jsonPayloadSchema: type: object description: Clear any queued text/audio from the current session. required: - type properties: type: type: string const: clear x-parser-schema-id: x-parser-schema-id: title: Clear Message description: Clear any queued text/audio from the current session. example: |- { "type": "clear" } bindings: [] extensions: - id: x-parser-unique-object-id value: TtsClearMessage bindings: [] extensions: *ref_0 - &ref_5 id: ttsOrpheusEnReceiveClose title: Tts orpheus en receive close description: Close session on Orpheus (English) type: receive messages: - &ref_18 id: TtsCloseMessage contentType: application/json payload: - name: Close Message description: Close the session and stop any further audio. type: object properties: - name: type type: string description: close required: true headers: [] jsonPayloadSchema: type: object description: Close the session and stop any further audio. required: - type properties: type: type: string const: close x-parser-schema-id: x-parser-schema-id: title: Close Message description: Close the session and stop any further audio. example: |- { "type": "close" } bindings: [] extensions: - id: x-parser-unique-object-id value: TtsCloseMessage bindings: [] extensions: *ref_0 - &ref_6 id: ttsOrpheusEnSendReady title: Tts orpheus en send ready description: Receive ready signal from Orpheus (English) type: send messages: - &ref_19 id: TtsReadyResponse contentType: application/json payload: - name: Ready Response description: Indicates the session is ready to receive messages. type: object properties: - name: type type: string description: ready required: true - name: session_id type: string description: Unique session identifier required: true headers: [] jsonPayloadSchema: type: object description: Indicates the session is ready to receive messages. required: - type - session_id properties: type: type: string const: ready x-parser-schema-id: session_id: type: string description: Unique session identifier x-parser-schema-id: x-parser-schema-id: title: Ready Response description: Indicates the session is ready to receive messages. example: |- { "type": "ready", "session_id": "sess_tts_abc123" } bindings: [] extensions: - id: x-parser-unique-object-id value: TtsReadyResponse bindings: [] extensions: *ref_0 - &ref_7 id: ttsOrpheusEnSendAudioChunk title: Tts orpheus en send audio chunk description: Receive audio chunk from Orpheus (English) type: send messages: - &ref_20 id: TtsAudioChunk contentType: application/json payload: - name: Audio Chunk description: Chunk of base64-encoded audio data. type: object properties: - name: type type: string description: audio_chunk required: true - name: data type: string description: Base64-encoded audio data required: true - name: sequence type: integer description: Sequence number for ordering chunks required: false headers: [] jsonPayloadSchema: type: object description: Chunk of base64-encoded audio data. required: - type - data properties: type: type: string const: audio_chunk x-parser-schema-id: data: type: string format: byte description: Base64-encoded audio data x-parser-schema-id: sequence: type: integer description: Sequence number for ordering chunks x-parser-schema-id: x-parser-schema-id: title: Audio Chunk description: Chunk of base64-encoded audio data. example: |- { "type": "audio_chunk", "data": "UklGRiQAAABXQVZFZm10IBAAAAABAAEA...", "sequence": 1 } bindings: [] extensions: - id: x-parser-unique-object-id value: TtsAudioChunk bindings: [] extensions: *ref_0 - &ref_8 id: ttsOrpheusEnSendSegmentStart title: Tts orpheus en send segment start description: Receive segment start from Orpheus (English) type: send messages: - &ref_21 id: TtsSegmentStart contentType: application/json payload: - name: Segment Start description: Signals the start of a synthesized segment. type: object properties: - name: type type: string description: segment_start required: true - name: segment_id type: string description: Unique segment identifier required: true headers: [] jsonPayloadSchema: type: object description: Signals the start of a synthesized segment. required: - type - segment_id properties: type: type: string const: segment_start x-parser-schema-id: segment_id: type: string description: Unique segment identifier x-parser-schema-id: x-parser-schema-id: title: Segment Start description: Signals the start of a synthesized segment. example: |- { "type": "segment_start", "segment_id": "seg_001" } bindings: [] extensions: - id: x-parser-unique-object-id value: TtsSegmentStart bindings: [] extensions: *ref_0 - &ref_9 id: ttsOrpheusEnSendSegmentEnd title: Tts orpheus en send segment end description: Receive segment end from Orpheus (English) type: send messages: - &ref_22 id: TtsSegmentEnd contentType: application/json payload: - name: Segment End description: Signals the end of a synthesized segment. type: object properties: - name: type type: string description: segment_end required: true - name: segment_id type: string description: Unique segment identifier required: true headers: [] jsonPayloadSchema: type: object description: Signals the end of a synthesized segment. required: - type - segment_id properties: type: type: string const: segment_end x-parser-schema-id: segment_id: type: string description: Unique segment identifier x-parser-schema-id: x-parser-schema-id: title: Segment End description: Signals the end of a synthesized segment. example: |- { "type": "segment_end", "segment_id": "seg_001" } bindings: [] extensions: - id: x-parser-unique-object-id value: TtsSegmentEnd bindings: [] extensions: *ref_0 - &ref_10 id: ttsOrpheusEnSendFlushed title: Tts orpheus en send flushed description: Receive flushed confirmation from Orpheus (English) type: send messages: - &ref_23 id: TtsFlushed contentType: application/json payload: - name: Flushed description: Acknowledges that buffered output was flushed. type: object properties: - name: type type: string description: flushed required: true headers: [] jsonPayloadSchema: type: object description: Acknowledges that buffered output was flushed. required: - type properties: type: type: string const: flushed x-parser-schema-id: x-parser-schema-id: title: Flushed description: Acknowledges that buffered output was flushed. example: |- { "type": "flushed" } bindings: [] extensions: - id: x-parser-unique-object-id value: TtsFlushed bindings: [] extensions: *ref_0 - &ref_11 id: ttsOrpheusEnSendCleared title: Tts orpheus en send cleared description: Receive cleared confirmation from Orpheus (English) type: send messages: - &ref_24 id: TtsCleared contentType: application/json payload: - name: Cleared description: Acknowledges that queued output was cleared. type: object properties: - name: type type: string description: cleared required: true headers: [] jsonPayloadSchema: type: object description: Acknowledges that queued output was cleared. required: - type properties: type: type: string const: cleared x-parser-schema-id: x-parser-schema-id: title: Cleared description: Acknowledges that queued output was cleared. example: |- { "type": "cleared" } bindings: [] extensions: - id: x-parser-unique-object-id value: TtsCleared bindings: [] extensions: *ref_0 - &ref_12 id: ttsOrpheusEnSendAudioEnd title: Tts orpheus en send audio end description: Receive audio end from Orpheus (English) type: send messages: - &ref_25 id: TtsAudioEnd contentType: application/json payload: - name: Audio End description: Signals the end of audio generation. type: object properties: - name: type type: string description: audio_end required: true - name: duration type: number description: Total audio duration required: false headers: [] jsonPayloadSchema: type: object description: Signals the end of audio generation. required: - type properties: type: type: string const: audio_end x-parser-schema-id: duration: type: number description: Total audio duration x-parser-schema-id: x-parser-schema-id: title: Audio End description: Signals the end of audio generation. example: |- { "type": "audio_end", "duration": 3.5 } bindings: [] extensions: - id: x-parser-unique-object-id value: TtsAudioEnd bindings: [] extensions: *ref_0 - &ref_13 id: ttsOrpheusEnSendError title: Tts orpheus en send error description: Receive error from Orpheus (English) type: send messages: - &ref_26 id: TtsErrorResponse contentType: application/json payload: - name: Error Response description: Indicates an error occurred during synthesis. type: object properties: - name: type type: string description: error required: true - name: code type: string description: Error code. enumValues: - auth_error - config_error - rate_limit - provider_error required: true - name: message type: string description: Human-readable error description required: true headers: [] jsonPayloadSchema: type: object description: Indicates an error occurred during synthesis. required: - type - code - message properties: type: type: string const: error x-parser-schema-id: code: type: string description: Error code. enum: - auth_error - config_error - rate_limit - provider_error x-parser-schema-id: message: type: string description: Human-readable error description x-parser-schema-id: x-parser-schema-id: title: Error Response description: Indicates an error occurred during synthesis. example: |- { "type": "error", "code": "provider_error", "message": "Provider returned an unexpected error" } bindings: [] extensions: - id: x-parser-unique-object-id value: TtsErrorResponse bindings: [] extensions: *ref_0 sendOperations: - *ref_1 - *ref_2 - *ref_3 - *ref_4 - *ref_5 receiveOperations: - *ref_6 - *ref_7 - *ref_8 - *ref_9 - *ref_10 - *ref_11 - *ref_12 - *ref_13 sendMessages: - *ref_14 - *ref_15 - *ref_16 - *ref_17 - *ref_18 receiveMessages: - *ref_19 - *ref_20 - *ref_21 - *ref_22 - *ref_23 - *ref_24 - *ref_25 - *ref_26 extensions: - id: x-parser-unique-object-id value: /v1/tts/slng/canopylabs/orpheus:en securitySchemes: - id: bearer name: bearer type: http description: > API key issued by SLNG. Pass as `Authorization: Bearer ` in the WebSocket upgrade request headers. scheme: bearer extensions: [] ````