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VoiceStudio — GPT-SoVITS Engine

GPT-SoVITS (RVC-Boss) is one of the most popular open-source voice-cloning systems (57k+ GitHub stars, MIT-licensed). It does zero-shot and few-shot cloning with excellent naturalness in Chinese, English, Japanese, Cantonese, and Korean, and it is very fast (RTF ~0.014 on suitable hardware).

Unlike VoiceStudio's other engines, GPT-SoVITS does not run inside the app. It ships as a standalone API server, and VoiceStudio connects to it over HTTP.

When to pick it

  • You already run (or want to run) a GPT-SoVITS server, e.g. with few-shot fine-tuned voices.
  • You need fast, natural cloning in zh/en/ja/yue/ko.

Setup

  1. Install and start the GPT-SoVITS API server (upstream project):

    cd GPT-SoVITS
python api_v2.py -a 127.0.0.1 -p 9880 -c GPT_SoVITS/configs/tts_infer.yaml

  2. Select the engine via Model Catalogue → Engines or OMNIVOICE_TTS_BACKEND=gpt-sovits.

VoiceStudio marks the engine available only when the server responds (2-second reachability probe).

Configuration

Variable Default Meaning
OMNIVOICE_GPTSOVITS_URL http://127.0.0.1:9880 API server URL
OMNIVOICE_TRUSTED_NETWORKS (unset) Required to allow a non-loopback server

Remote servers: by default VoiceStudio only talks to loopback addresses — part of the local-first guarantee. To point at a server on another machine (e.g. a GPU box on your LAN), add its network to OMNIVOICE_TRUSTED_NETWORKS; otherwise the connection is refused as an untrusted endpoint.

Prefer https:// (or a private tunnel such as Tailscale/WireGuard) for any non-loopback server: with plain http:// the text you synthesize and the audio that comes back cross the network unencrypted. VoiceStudio does not disable certificate verification, so a TLS endpoint needs a certificate the system trusts.

Behaviour notes

  • Output is 32 kHz mono (server output is resampled if needed).
  • Cloning passes your reference clip path and optional transcript to the server; the reference path must be readable by the server process, so remote servers need the clip on their own filesystem.
  • Speed control is forwarded as the server's speed_factor.
  • The GPU is whatever the GPT-SoVITS server itself uses (CUDA preferred); VoiceStudio's side is just an HTTP client.

Known limits

  • Five languages only; for broader coverage use OmniVoice (languages.md).
  • No voice design; server availability is your responsibility — if the server stops, generations fail with a "server not reachable" error.

Troubleshooting

  • "GPT-SoVITS server not reachable": start the server with the command above, or fix OMNIVOICE_GPTSOVITS_URL.
  • "endpoint is outside loopback or OMNIVOICE_TRUSTED_NETWORKS": see Configuration above.
  • Other issues: install/troubleshooting.md.

See also: benchmarks.md, expressive-speech.md.