Thanks, I'm (Javier's) T34C Mentor. Recent models do have turboprops I think, and I did notice the whining of the turbo change slightly when throttling down. I could however throttle down completely with the aircraft sinking like a stone without a change in the "main" engine sound. When I change RPM using the lever, the sound changes. I throttle down completely, cut the mixture, turn of ignition and avionics power (and consequently crash) with the engine sound (and propeller animation) continue essentially unchanged. Other planes don't do this on my installation. As I said, I'm having a lot of fun with this version of the plane, just wondering if this behaviour is particular to the model or whether I have an incorrect setting or incompatible whatnot.