237 lines
9.0 KiB
Markdown
237 lines
9.0 KiB
Markdown
Here is the clean, nicely formatted Markdown version of the technical specification document:
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# TECHNICAL INSTALLATION & INTEGRATION GUIDE FOR SOUNDFONT / VSTI IN DAW
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This document provides a detailed technical architecture model for integrating SoundFonts, WebAssembly Plugins (Client), and Native VSTi/AU (Server). It clearly delineates components pre-installed by the Developer (Coder) versus those open for User uploads and additions.
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---
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## 1. Architectural Distribution Overview (Developer vs. User)
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| Plugin / Asset Category | Processing Location | Installed By | Storage & Management Method | Security & Safety Profile |
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| --- | --- | --- | --- | --- |
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| **Default SoundFont (`.sf2`)** | Client (Wasm) | Coder | Static Assets hosted on Web Server / CDN | Extremely High |
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| **User Custom SoundFont (`.sf2`)** | Client (Wasm) | User | Browser `IndexedDB` or User Cloud Storage | Extremely High (Runs inside Wasm Sandbox) |
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| **WebAssembly Synths (WAMs)** | Client (JS/Wasm) | Coder | Bundled within Frontend Source Code | Extremely High |
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| **Core Server VSTi (Vital, Surge...)** | Server (Python) | Coder | System Directory inside Docker/Linux Container | High (Controlled binary footprint) |
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| **User Custom VST3 / Preset** | Server (Python) | User (Restricted) | Stores `.vst3` files or `.fxp`/`.json` on Container | High Security Risk (Requires Sandboxing) |
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---
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## 2. Client-Side Integration Tech (Browser / WebAssembly)
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The Client-Side handles zero-latency real-time composition and audio previews.
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### 2.1 Coder Pre-bundled Assets
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* **Static SoundFont Hosting:**
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* The developer places standard `.sf2` files (such as `GeneralUser_GS.sf2`) into the `public/soundfonts/` directory or hosts them via CDN.
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* Upon application startup, default SoundFonts are queried via REST API:
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```http
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GET /api/v1/assets/default-soundfonts
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```
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```json
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[
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{ "id": "sf_generaluser", "name": "GeneralUser GS v1.471", "size_mb": 31.2, "url": "/soundfonts/GeneralUser.sf2" },
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{ "id": "sf_sso", "name": "Sonatina Symphonic Orchestra", "size_mb": 95.0, "url": "/soundfonts/SSO.sf2" }
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]
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```
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* **FluidSynth WebAssembly Engine Integration:**
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* Compiles FluidSynth C/C++ code into WebAssembly (`fluidsynth.wasm` + `fluidsynth.js`) using Emscripten.
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* Alternatively, leverages open JavaScript wrappers such as `@soundfont/player` or `SpessaSynth`.
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### 2.2 Allowing User Custom SoundFont (`.sf2`) Uploads
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Delivers a flexible user experience without overloading server storage:
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* **Upload Mechanism & Local Cache (`IndexedDB`):**
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* Users drag and drop `.sf2` files directly into the DAW interface.
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* JavaScript reads the file as an `ArrayBuffer` via the `FileReader` API.
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* The file persists directly within the browser's local `IndexedDB` cache for immediate reuse across sessions without re-uploading to the server.
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* **Dynamic Injection into WebAssembly Memory:**
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```javascript
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// Client-side JavaScript snippet
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async function loadUserSoundFont(fileBuffer) {
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const uint8Array = new Uint8Array(fileBuffer);
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// Write buffer straight into Emscripten FluidSynth Virtual File System (MEMFS)
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Module.FS.writeFile('/user_font.sf2', uint8Array);
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// Call Wasm C-function to load bank
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const sfont_id = Module._fluid_synth_sfload(synthInstance, '/user_font.sf2', 1);
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console.log(`User SoundFont loaded successfully with ID: ${sfont_id}`);
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}
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```
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---
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## 3. Server-Side Integration Tech (Python Backend Engine)
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The Server-Side executes high-resolution offline WAV rendering when an operator triggers the Export / Bounce workflow.
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### 3.1 Server Environment Installed by Coder
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The developer configures the Server environment (or Docker Container) with pre-installed Native C++ libraries and Python utilities.
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1. **Server Base `Dockerfile` Configuration:**
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```dockerfile
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FROM python:3.10-slim
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# Install Linux audio libraries
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RUN apt-get update && apt-get install -y \
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fluidsynth \
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libfluidsynth-dev \
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libasound2-dev \
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libjack-jackd2-dev \
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build-essential \
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&& rm -rf /var/lib/apt/lists/*
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# Initialize directories for Native VST3 and system SoundFonts
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RUN mkdir -p /opt/daw_engine/vst3 \
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&& mkdir -p /opt/daw_engine/soundfonts
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WORKDIR /app
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COPY requirements.txt .
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RUN pip install --no-cache-dir -r requirements.txt
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```
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2. **Pre-installing Native VST3 Plugins:**
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Places 64-bit Linux `.vst3` binary builds of open-source synths inside `/opt/daw_engine/vst3/`:
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* `/opt/daw_engine/vst3/Vital.vst3`
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* `/opt/daw_engine/vst3/Surge XT.vst3`
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* `/opt/daw_engine/vst3/Dexed.vst3`
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3. **Python Backend Integration via Spotify `pedalboard`:**
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```python
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# render_engine/vst_loader.py
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import os
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from pedalboard import VST3Plugin, Pedalboard
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class PluginManager:
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def __init__(self, vst_dir="/opt/daw_engine/vst3"):
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self.vst_dir = vst_dir
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self.available_plugins = self._scan_plugins()
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def _scan_plugins(self):
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plugins = {}
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for root, dirs, files in os.walk(self.vst_dir):
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for file in files:
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if file.endswith(".vst3") or file.endswith(".so"):
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plugin_path = os.path.join(root, file)
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plugin_name = os.path.splitext(file)[0]
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plugins[plugin_name] = plugin_path
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return plugins
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def load_vst(self, plugin_name: str, preset_data: dict = None) -> VST3Plugin:
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if plugin_name not in self.available_plugins:
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raise FileNotFoundError(f"VST3 Plugin '{plugin_name}' not found on server.")
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path = self.available_plugins[plugin_name]
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vst_instance = VST3Plugin(path)
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# Inject parameters if provided
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if preset_data:
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for param_name, param_value in preset_data.items():
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setattr(vst_instance, param_name, param_value)
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return vst_instance
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```
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### 3.2 Handling User Custom Plugins / Presets
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#### Option 1: User Presets / Patches Uploads (**RECOMMENDED - Safe**)
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* **Implementation:** The backend locks native VST3 installations to common open engines (Vital, Dexed, Surge XT). Users upload lightweight preset patches like `.vitalbank`, `.syx` (DX7 patches), `.fxp`, or JSON parameter states.
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* **Workflow:**
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1. User selects the Vital Synth on the Client UI.
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2. User clicks "Import Preset" $\rightarrow$ Uploads a `.vital` file or JSON parameter bundle.
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3. Server parses JSON parameters and injects them directly into the VST3 instance via `pedalboard` during render execution.
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* **Benefits:** Absolutely safe, minimal footprint, zero security vulnerabilities to the host infrastructure.
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#### Option 2: User Native Binary VST3 Uploads (**HIGH RISK - Requires Isolation**)
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* **Risk:** A `.vst3` file contains executable machine code (`.so` Shared Object on Linux). Accepting arbitrary uploads grants 100% vector exposure to Remote Code Execution (RCE) attacks.
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* **Technical Mitigation (If Mandatory):**
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* **Sandboxing Isolation:** Every user Export/Render request runs inside an isolated, short-lived container (Ephemeral Docker / Firejail / gVisor) stripped of `root` privileges and completely isolated from external internet interfaces.
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* **Time-To-Live (TTL):** User `.vst3` binaries persist inside temporary directories `/tmp/user_sessions/{user_id}/` and purge automatically upon render job completion.
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---
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## 4. API Specification for SoundFonts & Plugins
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### 4.1 OpenAPI Endpoint Spec for Frontend
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```yaml
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/api/v1/plugins/available:
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get:
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summary: Query available VSTi engines and SoundFont resources on the Server
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responses:
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200:
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content:
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application/json:
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example:
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vst_instruments:
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- id: "vst_vital"
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name: "Vital Wavetable Synth"
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type: "VST3"
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has_native_support: true
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- id: "vst_dexed"
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name: "Dexed FM Synth"
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type: "VST3"
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has_native_support: true
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soundfonts:
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- id: "sf_generaluser"
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name: "GeneralUser GS"
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file: "GeneralUser.sf2"
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/api/v1/projects/render:
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post:
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summary: Trigger offline DAW Project rendering to WAV on the Server
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requestBody:
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required: true
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content:
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application/json:
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schema:
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$ref: '#/components/schemas/ProjectSchema'
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responses:
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200:
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description: Returns the URL pointing to the rendered WAV file
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```
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---
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## 5. Development Team Best Practices Summary
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* **SoundFont (`.sf2`):**
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* **For Users:** Encourage unrestricted local uploads on the Client (Browser). Store assets in `IndexedDB` to ensure optimal real-time performance without straining server resources.
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* **For Developers:** Supply 1–2 default General MIDI (GM) SoundFont banks (`GeneralUser_GS.sf2`) bundled on both Client and Server.
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* **VSTi Instruments:**
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* **For Developers:** Pre-install top open-source Linux-native synths on the Server (Vital, Surge XT, Dexed, OB-Xd).
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* **For Users:** Do **not** allow direct `.vst3` binary uploads to the production server. Instead, permit users to upload Presets / Patches / JSON parameters for the supported synth models. This guarantees 100% security while saving storage and network bandwidth. |