I am attempting my first mod and I've been able to modify a jet engine B-9's F-119 to include a non-afterburning and an afterburning mode in terms of performance. I'd like to add specific FX definitions only when the afterburner is engaged, and then be removed when the engine is switched into non-afterburning again. Can anyone tell me how to make FX effects phase in and out? Thanks in advance, CFG file extracts below: ... // --- FX definitions --- fx_exhaustLight_yellow = 0.0, 0.0, 0.0, 0.0, 0.0, 1.0, power fx_smokeTrail_light = 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, power // I want this to only engage on AB mode // fx_exhaustFlame_blue = 0.0, 1.0, 0.0, 0.0, 1.0, 0.0, power fx_exhaustSparks_flameout = 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, flameout ... MODULE { name = HydraEngineController primaryModeName = Mil-power secondaryModeName = Afterburn // Mil-power Mode primaryEngine { ... // Afterburn Mode secondaryEngine { ... MODULE { name = ModuleAnimateHeat ThermalAnim = jet_engine_f119_heat } I'm not certain but I think this controls the nozzle flaps in conjunction with the control surfaces. MODULE { name = FXModuleConstrainPosition matchRotation = true matchPosition = false CONSTRAINFX { targetName = lookatfx_target1 moversName = plate1_holder } }