> For the complete documentation index, see [llms.txt](https://docs.plumvoice.com/dev/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.plumvoice.com/dev/developer-reference.md).

# 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: \<voice> 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)