> ## 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. # Aura 2 (Spanish) > Stream low-latency conversational Spanish text-to-speech from SLNG-hosted Deepgram Aura 2 over WebSocket, optimized for production voice agents. ## AsyncAPI ````yaml api-reference/asyncapi/tts-slng.asyncapi.yaml /v1/tts/slng/deepgram/aura:2-es id: /v1/tts/slng/deepgram/aura:2-es title: Aura 2 (Spanish) description: >- Stream low-latency conversational Spanish text-to-speech from SLNG-hosted Deepgram Aura 2 over WebSocket, optimized for production voice agents. servers: - id: production protocol: wss host: api.slng.ai bindings: [] variables: [] address: /v1/tts/slng/deepgram/aura:2-es parameters: [] bindings: - protocol: ws version: latest value: method: GET headers: type: object properties: X-Region-Override: type: string description: >- Target region override. Auto-selected if not provided. Available regions: `eu-north-1`. enum: - eu-north-1 x-parser-schema-id: 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: WebsocketHeadersSlngAuraEs schemaProperties: - name: method type: string description: GET required: false - name: headers type: object required: false properties: - name: X-Region-Override type: string description: >- Target region override. Auto-selected if not provided. Available regions: `eu-north-1`. enumValues: - eu-north-1 required: false - 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: ttsSlngDeepgramAura2EsReceiveInit title: Tts slng deepgram aura2 es receive init description: Initialize session on Aura 2 (Spanish) type: receive messages: - &ref_11 id: SlngDeepgramAura2EsTtsInitRequest contentType: application/json payload: - name: Init Request description: Initialize an SLNG Deepgram Aura 2 Spanish TTS session. type: object properties: - name: type type: string description: init required: true - name: model type: string description: Voice model identifier (Spanish) enumValues: - aura-2-agustina-es - aura-2-alvaro-es - aura-2-antonia-es - aura-2-aquila-es - aura-2-carina-es - aura-2-celeste-es - aura-2-diana-es - aura-2-estrella-es - aura-2-gloria-es - aura-2-javier-es - aura-2-luciano-es - aura-2-nestor-es - aura-2-olivia-es - aura-2-selena-es - aura-2-silvia-es - aura-2-sirio-es - aura-2-valerio-es required: true - name: voice type: string description: Voice identifier (same as model) enumValues: - aura-2-agustina-es - aura-2-alvaro-es - aura-2-antonia-es - aura-2-aquila-es - aura-2-carina-es - aura-2-celeste-es - aura-2-diana-es - aura-2-estrella-es - aura-2-gloria-es - aura-2-javier-es - aura-2-luciano-es - aura-2-nestor-es - aura-2-olivia-es - aura-2-selena-es - aura-2-silvia-es - aura-2-sirio-es - aura-2-valerio-es 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 (mp3/opus not supported for self-hosted Deepgram WebSocket streaming) enumValues: - linear16 - mulaw - alaw 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. Encoding restricted to linear16/mulaw/alaw for self-hosted Deepgram WebSocket streaming. required: - type - model properties: type: type: string const: init default: init x-parser-schema-id: model: type: string description: Voice model identifier (Spanish) enum: - aura-2-agustina-es - aura-2-alvaro-es - aura-2-antonia-es - aura-2-aquila-es - aura-2-carina-es - aura-2-celeste-es - aura-2-diana-es - aura-2-estrella-es - aura-2-gloria-es - aura-2-javier-es - aura-2-luciano-es - aura-2-nestor-es - aura-2-olivia-es - aura-2-selena-es - aura-2-silvia-es - aura-2-sirio-es - aura-2-valerio-es x-parser-schema-id: voice: type: string description: Voice identifier (same as model) enum: - aura-2-agustina-es - aura-2-alvaro-es - aura-2-antonia-es - aura-2-aquila-es - aura-2-carina-es - aura-2-celeste-es - aura-2-diana-es - aura-2-estrella-es - aura-2-gloria-es - aura-2-javier-es - aura-2-luciano-es - aura-2-nestor-es - aura-2-olivia-es - aura-2-selena-es - aura-2-silvia-es - aura-2-sirio-es - aura-2-valerio-es 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 (mp3/opus not supported for self-hosted Deepgram WebSocket streaming) default: linear16 enum: - linear16 - mulaw - alaw x-parser-schema-id: 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 an SLNG Deepgram Aura 2 Spanish TTS session. example: |- { "type": "init", "model": "aura-2-celeste-es", "voice": "aura-2-celeste-es", "config": { "sample_rate": 24000, "encoding": "linear16" } } bindings: [] extensions: - id: x-parser-unique-object-id value: SlngDeepgramAura2EsTtsInitRequest bindings: [] extensions: &ref_0 - id: x-parser-unique-object-id value: /v1/tts/slng/deepgram/aura:2-es - &ref_2 id: ttsSlngDeepgramAura2EsReceiveText title: Tts slng deepgram aura2 es receive text description: Send text to Aura 2 (Spanish) type: receive messages: - &ref_12 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: ttsSlngDeepgramAura2EsReceiveFlush title: Tts slng deepgram aura2 es receive flush description: Flush buffered output on Aura 2 (Spanish) type: receive messages: - &ref_13 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: ttsSlngDeepgramAura2EsReceiveClear title: Tts slng deepgram aura2 es receive clear description: Clear queued output on Aura 2 (Spanish) type: receive messages: - &ref_14 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: ttsSlngDeepgramAura2EsReceiveClose title: Tts slng deepgram aura2 es receive close description: Close session on Aura 2 (Spanish) type: receive messages: - &ref_15 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: ttsSlngDeepgramAura2EsSendMetadata title: Tts slng deepgram aura2 es send metadata description: Receive metadata response from Aura 2 (Spanish) type: send messages: - &ref_16 id: SlngDeepgramAura2EsMetadataResponse contentType: application/json payload: - name: Metadata Response description: >- Server metadata response after SLNG Deepgram Aura 2 Spanish session initialization. type: object properties: - name: type type: string description: Metadata required: true - name: request_id type: string description: Unique request identifier required: true - name: model_name type: string description: Name of the model used for synthesis required: true - name: model_version type: string description: Version of the model required: true - name: model_uuid type: string description: Unique model identifier required: true headers: [] jsonPayloadSchema: type: object description: >- Metadata response sent by the server after a successful session initialization. Contains model information and a unique request identifier. required: - type - request_id - model_name - model_version - model_uuid properties: type: type: string const: Metadata x-parser-schema-id: request_id: type: string format: uuid description: Unique request identifier x-parser-schema-id: model_name: type: string description: Name of the model used for synthesis x-parser-schema-id: model_version: type: string description: Version of the model x-parser-schema-id: model_uuid: type: string format: uuid description: Unique model identifier x-parser-schema-id: x-parser-schema-id: title: Metadata Response description: >- Server metadata response after SLNG Deepgram Aura 2 Spanish session initialization. example: |- { "type": "Metadata", "request_id": "a7e2f4b1-3c89-4d5a-b6e1-9f8a7c6d5e4b", "model_name": "aura-2-celeste-es", "model_version": "2025-04-15.0", "model_uuid": "f1a2b3c4-5d6e-7f8a-9b0c-1d2e3f4a5b6c" } bindings: [] extensions: - id: x-parser-unique-object-id value: SlngDeepgramAura2EsMetadataResponse bindings: [] extensions: *ref_0 - &ref_7 id: ttsSlngDeepgramAura2EsSendAudioChunk title: Tts slng deepgram aura2 es send audio chunk description: Receive audio chunk from Aura 2 (Spanish) type: send messages: - &ref_17 id: SlngDeepgramAuraTtsAudioChunk contentType: application/octet-stream payload: - name: Audio Chunk description: Raw binary audio buffer from SLNG Deepgram Aura. type: object properties: - name: type type: string description: >- Placeholder discriminator. The actual message is a raw binary WebSocket frame, not JSON. required: true headers: [] jsonPayloadSchema: type: object description: >- Raw binary audio data sent as a WebSocket binary frame. This is NOT a JSON message — it is a raw audio buffer (e.g. linear16 PCM bytes). The encoding and sample rate match the values specified in the init message config. The object schema below is for documentation purposes only as required by the AsyncAPI tooling. required: - type properties: type: type: string const: binary description: >- Placeholder discriminator. The actual message is a raw binary WebSocket frame, not JSON. x-parser-schema-id: x-parser-schema-id: title: Audio Chunk description: Raw binary audio buffer from SLNG Deepgram Aura. example: >- "0000FF00000000FF00000000010101010101010100000000FFFFFFFFFFFEFEFDFEFEFEFEFDFDFEFEFEFEFEFEFEFEFEFFFFFFFFFEFEFEFEFF0001000001020303030303030303030201010000FFFFFEFDFDFDFDFEFFFFFFFF0001020303020201000000FFFDFCFBFAFAFBFAF9F8F7F7F7F6F6F4F2F2F3F7FC000406090F14191A19181715110E0A05FEF9F6F3F0EEECEBEBECEEF2F6F9FC0005090D0F101010100E0C080401" bindings: [] extensions: - id: x-parser-unique-object-id value: SlngDeepgramAuraTtsAudioChunk bindings: [] extensions: *ref_0 - &ref_8 id: ttsSlngDeepgramAura2EsSendFlushed title: Tts slng deepgram aura2 es send flushed description: Receive flushed confirmation from Aura 2 (Spanish) type: send messages: - &ref_18 id: SlngDeepgramAuraTtsFlushed contentType: application/json payload: - name: Flushed description: >- Acknowledges that buffered output was flushed from SLNG Deepgram Aura. type: object properties: - name: type type: string description: Flushed required: true - name: sequence_id type: integer description: Sequence identifier for the flushed segment required: true headers: [] jsonPayloadSchema: type: object description: Acknowledges that buffered output was flushed. required: - type - sequence_id properties: type: type: string const: Flushed x-parser-schema-id: sequence_id: type: integer description: Sequence identifier for the flushed segment x-parser-schema-id: x-parser-schema-id: title: Flushed description: Acknowledges that buffered output was flushed from SLNG Deepgram Aura. example: |- { "type": "Flushed", "sequence_id": 0 } bindings: [] extensions: - id: x-parser-unique-object-id value: SlngDeepgramAuraTtsFlushed bindings: [] extensions: *ref_0 - &ref_9 id: ttsSlngDeepgramAura2EsSendCleared title: Tts slng deepgram aura2 es send cleared description: Receive cleared confirmation from Aura 2 (Spanish) type: send messages: - &ref_19 id: SlngDeepgramAuraTtsCleared contentType: application/json payload: - name: Cleared description: >- Acknowledges that queued output was cleared from SLNG Deepgram Aura. 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 from SLNG Deepgram Aura. example: |- { "type": "Cleared" } bindings: [] extensions: - id: x-parser-unique-object-id value: SlngDeepgramAuraTtsCleared bindings: [] extensions: *ref_0 - &ref_10 id: ttsSlngDeepgramAura2EsSendError title: Tts slng deepgram aura2 es send error description: Receive error from Aura 2 (Spanish) type: send messages: - &ref_20 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 sendMessages: - *ref_11 - *ref_12 - *ref_13 - *ref_14 - *ref_15 receiveMessages: - *ref_16 - *ref_17 - *ref_18 - *ref_19 - *ref_20 extensions: - id: x-parser-unique-object-id value: /v1/tts/slng/deepgram/aura:2-es 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: [] ````