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Hello,

i replaced in one of my Genesis GP9's the old OEM-TSU with the new Soundtraxx Tsunami TSU2:





It sounds great and i like the dynamic sound changes depending on acceleration and load changes.
You can move the light loco still in notch 1 without reving up into the higher notches or you can got straight to notch 8. It depends onto how slow or how fast you will open the throttle. And when the loco has accelerated to you pre-selected speed, the engine will notch down but the speed will stay consistent. With a light loco it notches down to notch 1. But if there is an heavy train to be pulled, the engine will notch down after acceleration only to notch 3 or 4 depending on the rolling resistance of the train.
Thee is also real brake function which i like.


Lutz