slash_empty.mp3
	as CC-BY 3.0
	by beerbelly38 (https://freesound.org/people/beerbelly38/sounds/362348/)
slash_hit1.mp3
	as CC0
	by nicktermer (https://freesound.org/people/nicktermer/sounds/259542/)
slash_hit2.mp3
	as CC-BY 3.0
	by LittleRobotSoundFactory (https://freesound.org/people/LittleRobotSoundFactory/sounds/270478/)