The audio side needed some love, too.

Today most of the changes affected the audio side of the game.

CHANGELOG

• Implemented a sounds playback system that ensures sounds are always played and that allows setting the volume on a per-sound basis.
• Made volume of explosions sounds depend on the distance to the soldier.
• Added entrance gate sound.
• Changed explosion sound (maybe not be final yet).
• Avoided abrupt clipping of sounds at the end of a level.
• Fixed animation of fast-moving enemies.
• Fixed handling of beam hits.
• Made various other changes.