HeadspaceMixer is only used in old versions of FlyingGuns. Since Java3D 1.3.2, HeadspaceMixer was removed from the Java3D distribution.
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So try to get hold of an 1.3.1 release of Java3D or build FlyingGuns from sources with later versions of Java3D.
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The bad news is that the current soundmixer in Java3D is very poor featurewise. E.g. pitching is no longer supported so you just cannot hear how your throttle is set. |