The transitions between idle/revving/idle seem to be quite good on the IBU3 with diesel sounds, but not with the abrams... maybe i can upload a video from my own test later.
I also had the issue that the engine startup sound was played after powering on the tank, but after stopping the engine and starting it again via the radio it didnt play the startup sound but the idle motor sound immediately.
Looking forward to get my TK60G2