An alarm sound effect produced from applying the dfx skidder vst effect onto a very, very slowed down recording of me whistling. It's ended up sounding uncannily like another alarm sound effect from gerry anderson's "thunderbirds" (played whenever you see those portraits with the eyes that light up).
I recorded using a zoom h6 with an xy mic and foam screen and tripod. I placed the mic above the piece of paper. I wrote on a piece of paper on a desk with a pen at a slow pace and the fast pace, then i wrote with a pencil at a slow pace and then fast pace. Recorded for a school project for a sfx library.
A testpicture which shows a greyscale in sstv using mode martin1. Sstv stands for "slow scan television". Sstv is a kind of modulation to send a frozen picture enclosed in a transmissionchannel normally used for speech. This allowes to send pictures directly, for instance, on shortwave.