Today I had a student ask how to make old science fiction machinery sounds. The sound he wanted was for a robot starting up then slowly shutting down. We tried a few different things and finally settled on using Reason to create a random sequence of notes.
I started with a chromatic scale and then randomized it using the change events function. We played it back in Subtractor and messed with the patch until it sounded like what he was going for. The tricky part was pitch bending the sequence. Reason 3.5 does not support tempo automation, so although we could use the pitch bend wheel the notes were all at the same speed. To get around this we exported the audio and loaded it into NN-XT as a sample, then applied automation to the pitch wheel with a twenty four semitone range.
Robot Shutdown
As I was editing this document two dogs came running into my studio. They were very attracted to the squeaky toy sound for obvious reasons. I only have one dog so it might seem a little strange that two dogs came into my studio. 
I got this strange plastic wind up toy at a work event several years ago. I wrapped a rubber band around his neck because he started falling apart and spilling his guts all over the place. A little glue would probably fix that, but after this experiment I suspect that he is likely to get forgotten in a drawer for another few years. He shoots sparks and walks in a not so straight line. His labor intensive stumbling gate also makes quite a racket as you will notice from the recording.
Today while tapping (no pun intended) the archives I came across this example of a recording I made of gurgling water in a glass by blowing through a straw. I posted a similar albeit higher pitched example a while ago in the entry