Original exercise content and generated recordings are part of Call Capture Lab. The current recordings were generated using ElevenLabs Eleven v3. Playback uses prerecorded audio; learners do not download model weights or connect to a speech-generation service.
Lucy - Fresh & Casual is the British receptionist. Christopher - Gentle and Trustworthy, Mark - Natural Conversations and Tom - Conversations & Books are the British, American and Australian callers respectively. The voices were selected from the account’s saved ElevenLabs voices. These are fictional practice conversations.
The generated audio is governed by the applicable ElevenLabs terms; it is not offered under an open model licence. The retained British dialogues and the complete turns generated through the ElevenLabs MCP plugin preserve their internal phrasing, with volume matching for playback.
Earlier recordings used MIT-licensed Chatterbox Turbo with original synthetic voice references designed using Apache-licensed Qwen3-TTS. Their source tooling and licence references are retained in the project.
Chatterbox licence · Qwen3-TTS licence
Kokoro-82M model: Apache License 2.0. kokoro-onnx inference wrapper: MIT License. The generation tooling and full licence references are preserved with the project source.
Kokoro model licence · kokoro-onnx licence
MIT License. Copyright (c) 2020 Phosphor Icons.
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
This frontend uses React (MIT, Meta Platforms, Inc. and affiliates) and Vite (MIT). Their licence notices are included in the project dependency sources.
The previous Australian recordings used MyShell MeloTTS English v2, MIT licensed. The voice is synthetic and is one example of an accent.
MeloTTS licence · English v2 model
Newsreader and DM Sans use SIL Open Font License 1.1.