AudioFilter

-- This assumes the workspace contains a Part with an AudioEmitter and an AudioPlayer, and the camera has an AudioListener
local RunService = game:GetService("RunService")

local part: BasePart = workspace.Part
local camera: Camera = workspace.CurrentCamera
local audioPlayer: AudioPlayer = part.AudioPlayer
local audioEmitter: AudioEmitter = part.AudioEmitter
local audioListener: AudioListener = camera.AudioListener

local raycastParams = RaycastParams.new()
raycastParams.FilterDescendantsInstances = {audioEmitter.Parent}
raycastParams.FilterType = Enum.RaycastFilterType.Exclude

-- Create a new AudioFilter
local filter: AudioFilter = Instance.new("AudioFilter")
filter.FilterType = Enum.AudioFilterType.Lowpass12dB
filter.Frequency = 22000
filter.Q = math.sqrt(2) / 2  -- This Q value produces a flat lowpass for the 12dB slope type
filter.Parent = part

-- Put the AudioFilter between the player and the emitter
local function wireTo(source: Instance, target: Instance): Wire
    local wire = Instance.new("Wire")
    wire.SourceInstance = source
    wire.TargetInstance = target
    wire.Parent = target
end
wireTo(audioPlayer, filter)
wireTo(filter, audioEmitter)  

-- Update the filter based on the positions of the emitter and listener
RunService.Heartbeat:Connect(function()
    local emitterPos: Vector3 = part.Position
    local listenerPos: Vector3 = camera.CFrame.Position
    
    local raycastResult = workspace:Raycast(emitterPos, (listenerPos - emitterPos), raycastParams)
    filter.Frequency = if raycastResult then 500 else 22000
end)