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<p>There is a way of adjusting chuff rate on O guage MTH locomotives with Protosound 2.0 using the DCS system, I assume it would be the same with the HO locomotives, but I dont own one myself.  I also dont have any Protosound 3 steam locomotives at this time, so I dont have any experience dealing with the new system with steam.  3 chuffs per revolution might be the factory default setting.  I believe most stores that are a "MTH megastation" will have a test track and working DCS system, you might try taking it to one and having them adjust it (call first), not all model train stores are created equal. </p>
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