# Developer Reference - [Tutorial](https://docs.plumvoice.com/dev/developer-reference/tutorial.md) - [How to...](https://docs.plumvoice.com/dev/developer-reference/how-to.md) - [Use Plum's Transcription API](https://docs.plumvoice.com/dev/developer-reference/how-to/use-plums-transcription-api.md) - [Audio Formats and Prompts](https://docs.plumvoice.com/dev/developer-reference/audio-formats-and-prompts.md) - [Grammars and Speech Recognition](https://docs.plumvoice.com/dev/developer-reference/grammars-and-speech-recognition.md) - [Available ASR Engines](https://docs.plumvoice.com/dev/developer-reference/available-asr-engines.md) - [TTS Engine Characteristics](https://docs.plumvoice.com/dev/developer-reference/tts-engine-characteristics.md) - [Amazon Polly TTS Engine](https://docs.plumvoice.com/dev/developer-reference/tts-engine-characteristics/amazon-polly-tts-engine.md) - [Polly Voice Tag Attribute Details](https://docs.plumvoice.com/dev/developer-reference/tts-engine-characteristics/amazon-polly-tts-engine/polly-voice-tag-attribute-details.md) - [AT\&T Natural Voices](https://docs.plumvoice.com/dev/developer-reference/tts-engine-characteristics/at-and-t-natural-voices.md) - [Cepstral Engine](https://docs.plumvoice.com/dev/developer-reference/tts-engine-characteristics/cepstral-engine.md) - [RealSpeak Engine](https://docs.plumvoice.com/dev/developer-reference/tts-engine-characteristics/realspeak-engine.md) - [Vocalizer 7](https://docs.plumvoice.com/dev/developer-reference/tts-engine-characteristics/vocalizer-7.md) - [Vocalizer 7: \ tag and SSML Support](https://docs.plumvoice.com/dev/developer-reference/tts-engine-characteristics/vocalizer-7/vocalizer-7-less-than-voice-greater-than-tag-and-ssml-support.md): For Vocalizer 7 - [Data Exchange](https://docs.plumvoice.com/dev/developer-reference/data-exchange.md) - [Logging](https://docs.plumvoice.com/dev/developer-reference/logging.md) - [Caching](https://docs.plumvoice.com/dev/developer-reference/caching.md) - [Root Documents](https://docs.plumvoice.com/dev/developer-reference/root-documents.md) --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.plumvoice.com/dev/developer-reference.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.