FSRAC 4.0 is the only addon for Microsoft Flight Simulator that puts full control of your audio environment inside the cockpit—now compatible with MSFS 2020 and MSFS 2024.
Use your aircraft’s radio volume knobs to adjust the sound of third-party tools—just like in real life.
Whether you're flying a default A320 or a high-fidelity payware aircraft, FSRAC supports virtually any plane with modeled knobs. No other addon offers this level of audio immersion and realism.
What’s New in FSRAC 4.0?
Auto-Ducking System with Dynamic Rules
Let’s face it—every simmer’s been there:
ATC shouting instructions, the PA making a cabin announcement, GSX requesting pushback clearance, and your favorite music or podcast all competing for your attention. Audio chaos.
FSRAC 4.0 fixes that.
With the new Auto-Ducking System, you can define smart rules to automatically lower the volume of certain channels when others are active. For example:
Lower MSFS, cabin annoucements and music (browser or other) when ATC is talking
Lower PA audio when GSX is talking
Lower PA and MSFS audio when FS2Crew is talking.
You’re in control. Define the triggers, the targets, and the ducking intensity—all with a few clicks.
✅ Universal aircraft support — default and add-on aircraft supported via modeled knobs
✅ No FSUIPC required for core functionality
✅ Dual modes (Default and Extended) for basic and advanced knob configurations
✅ Captain-side controls by default (FO side configurable via tool)
✅ Standalone configuration tool for managing custom profiles
✅ NEW: Dynamic volume rules based on who’s talking
Preconfigured Profiles Out of the Box
FSRAC comes ready-to-use for many popular aircraft, including:
Fenix A320 (CFM, IAE, SL variants)
PMDG 737-800, 737-900, and 777-300ER (LIMITED SUPPORT: no modeled knobs, but HF sensitivity knobs work)
Very very smart bridge that finally can bring to new life knobs for operational radio panel aircrafts. Very useful to fast control directly from cockpit all main audio app such cabin announcements, fs2crew, and first of all ATC from knob as must be !