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DP SV MOVETYPESTEP LANDEVENT
From Quake Wiki
Field definitions:
.void(vector vImpactVelocity) movetypesteplandevent;
This field function, when provided, is triggered on a MOVETYPE_STEP entity when it experiences "land event".
The standard engine behavior for this event is to play the sv_sound_land CVar sound.
The parameter provides the velocity of the entity at the time of the impact. The z value may therefore be used to calculate how "hard" the entity struck the surface.
NOTE: If this field function is provided on a MOVETYPE_STEP entity, the standard sv_sound_land sound IS SUPPRESSED to allow for authors to create their own feedback.