new-horizons/NewHorizons/Patches/EyeScenePatches/TravelerEyeControllerPatches.cs

using HarmonyLib;
using NewHorizons.Handlers;
using System.Linq;

namespace NewHorizons.Patches.EyeScenePatches
{
    [HarmonyPatch(typeof(TravelerEyeController))]
    public static class TravelerEyeControllerPatches
    {
        [HarmonyPrefix]
        [HarmonyPatch(nameof(TravelerEyeController.OnStartCosmicJamSession))]
        public static bool TravelerEyeController_OnStartCosmicJamSession(TravelerEyeController __instance)
        {
            if (!EyeSceneHandler.GetActiveCustomEyeTravelers().Any())
            {
                return true;
            }
            // Not starting the loop audio here; EyeMusicController will handle that
            __instance._signal.GetOWAudioSource().SetLocalVolume(0f);
            return false;
        }
    }
}