This sample was happily granted to us by my cat, an 18 pound red McTabby, Angelo. I took this sample of him happily purring on my lap, added a brain wave synchronization and then put in an interesting kind of reverb that makes the sound move back and forth from left to right. There are some very interesting frequencies in there if you listen carefully. A cats purr can actually be very complex, soundwise... and I think this is a great example of that. LISTENING TIP: USE A HEADSET.
in reference octave and octave higher - 3 versions: original, mixed with itself (1 cat mode - short delay plus swapped channels), mixed with itself (2 cats mode - very long delay plus swapped channels).