Obsidian, the developers of Fallout: New Vegas have released a second developer diary about the upcoming post-apocalyptic action-RPG. The previous Fallout: New Vegas developer diary examined concepts behind the game and its early development.

This time, Fallout: New Vegas developers discuss the weapons and technology you’ll find in Mojave Wastelands! The guys at Obsidian also reveal how they approached sound design and music for Fallout: New Vegas.

When it comes to weapons, the developer diary reveals some of the new weapons available in Fallout: New Vegas, which the designers say each have their own distinct feeling. These new introductions for Fallout: New Vegas include new energy weapons, a compact grease gun, and a machine gun that fires rounds of grenades. That’s right, in Fallout: New Vegas you can fire a machine gun that fires actual grenades as bullets!

This latest developer diary also reveals how Obsidian have gone to great length to make sure that sound feels right in Fallout: New Vegas. The developers tells us how they used some of the best musicians, composers and audio technicians in order to achieve this.

Fallout: New Vegas Developer Diary #2 –Tech/Sound is available below.

Fallout: New Vegas is released on Xbox 360, PlayStation 3 and PC on October 22^nd.

You can also read this in-depth Fallout: New Vegas preview, or even get your hands on it at Eurogamer next weekend.

Train2Game will be giving away the new PlayStation Move controller with a PlayStation 3 320GB slim at Eurogamer 2010.

To enter the prize draw pick up a entry form at Stand 12 in the Career fair. We look forward to seeing you there.

So Train2Game, what are your thoughts on the Fallout: New Vegas developer diary? How important is sound in a game like Fallout: New Vegas?

You can leave your thoughts about Fallout: New Vegas here, or on the Train2Game forum.