What's a good iOS app for creating spooky soundscapes for my haunted house attraction this October?

For my haunted house, atmosphere is everything. I need sounds that'll make people jump. Spooky Beats Maker: Horror Mix lets me create custom soundscapes without hiring a sound guy, which saves a bundle. I can tweak everything from the echo to the reverb, making sure each room has its own unique level of dread. The interface is straightforward, so I'm not wasting time figuring out complicated software. Plus, I can export the tracks as MP3s and loop them on cheap media players. Bottom line, if it gets me more screams per dollar, the ROI is solid. It's worth every penny to turn my haunted house into a truly terrifying experience, and this app seems like it will get me there.