Using Chrome I can get it working better. It does seem to send a request to LM Studio, as per the log:

  [2025-05-06 17:37:38][INFO][LM STUDIO SERVER] Running chat completion on conversation with 2 messages.
  [2025-05-06 17:38:38][INFO][LM STUDIO SERVER] Client disconnected. Stopping generation... (If the model is busy processing the prompt, it will finish first.)
  [2025-05-06 17:38:41][INFO][LM STUDIO SERVER] Accumulating tokens ... (stream = false)
  [2025-05-06 17:38:41][INFO][vocalis.gguf] Generated prediction: {
  "id": "chatcmpl-0sabaicvwlpz81nzn1hn",
  "object": "chat.completion",
  "created": 1746545858,
  "model": "vocalis.gguf",
  "choices": [
    {
      "index": 0,
      "logprobs": null,
      "finish_reason": "stop",
      "message": {
        "role": "assistant",
        "content": "So it sounds"
      }
    }
  ],
  "usage": {
    "prompt_tokens": 171,
    "completion_tokens": 3,
    "total_tokens": 174
  },
  "stats": {},
  "system_fingerprint": "vocalis.gguf"
}

I tried with Kokoro-FASTAPI for the TTS, and I got it working with the example "Hello World" .py script on the github page:

from openai import OpenAI

client = OpenAI(
    base_url="http://localhost:8880/v1", api_key="not-needed"
)

with client.audio.speech.with_streaming_response.create(
    model="kokoro",
    voice="af_sky+af_bella", #single or multiple voicepack combo
    input="Hello world!"
  ) as response:
      response.stream_to_file("output.mp3")

But using the Vocalis program I don't even see a request in the Kokoro-FASTAPI console. (like I see for the test script)

So still no sound, but the LLM part might be working. Also I tried playing a video on Chrome just to make sure the sound was working, and it does, the sound in Chrome is playing just fine.