A sound made by compressing and warping and reversing simple vocals , like "hello" and "how are you" can be used for creepy alien sounds, or computer voices, made using the free audacity.
Bass made for dnb or dubstep. Waw, sound was made in fm8 synth by native instruments, i uploaded the waw format, because i can't upload ksd patch for fm8 here.
This recording is made with a zoom h1 recorder. This sound is made while putting several items such as woollen cloth,keys and a head rubber inside a grand piano.
I made a creepy sea monster sound. I just took something with a soft and bouncy texture. Shaked it around and pitched it down and put vocoder on it. Made with audacity.