So I tried using URLs of audio files to play as the first message. But I don't get good results. Here are some examples: Example 1 (MP3): [Audio file source](https://api.twilio.com/cowbell.mp3) Conversation ID:

6a1b71db-56bd-445e-9e31-af5f8552cb31

I got the audio file from Twilio's documentation. The message is inaudible. I get the same results when trying other mp3 files as well (encoded at 50kb and 100kb). Example 2 (WAV): [Audio file source](https://file-examples.com/storage/fe7f95684167ed3aeaaf793/2017/11/file_example_WAV_1MG.wav) Conversation ID:

07357f83-ebce-4711-ab4e-f3ce79e85c6e

In this example the audio plays but it plays slow. I would really like to use that feature.

Hi there! 👋 I understand you're having issues with playing audio files as the first message in Vapi. I don't have specific information about your particular conversation IDs or those exact audio files, but I can help explain some potential reasons for the issues you're experiencing. According to the information I found, Vapi typically sends a JSON message as the first message, not an audio file. However, I can share some insights about potential causes for your audio playback issues: ### MP3 Files Being Inaudible There could be several reasons why your MP3 files are inaudible: 1. **Audio Encoding/Decoding Issues**: There might be an issue with how Vapi encodes or decodes audio data. An "EncodingError: Unable to decode audio data" could be the reason why the MP3 file is inaudible [Discord thread](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1335246255705690265). 2. **Audio Caching Problems**: The caching mechanism used by the voice provider might be causing issues. The cache is maintained by the voice provider, not Vapi [Discord thread](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1342338583721414677). 3. **Transcriber Issues**: A "deafness bug" where the assistant doesn't hear anything could be the cause [Discord thread](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1343612796717371393). ### WAV Files Playing Slowly For the slow playback of WAV files, potential causes include: 1. **Network Latency and API Performance**: According to a [Discord thread](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1332286268805087272), "There could be several factors contributing to the delay, such as network latency, API performance, or the complexity of the voice application logic."

checking if this is resolved/solved for you?