In another post you mentioned that you're using a Tsunami 2. That decoders chuff feature works off the motors BEMF. Without the Tsunami actually driving the motor it doesn't know that it's moving. The Airwire G3 is better suited for use with the Phoenix type soundcard. With a Tsunami decoder your better off using one the Airwire Cnvrtr boards as those are nothing more than a radio receiver and mini DCC command booster.
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