I switched on and off an old tape recorder. You can hear hum noise like an early synthesizer. The reason why it makes such noise is not sure, but that's the most important part of analog devices. Computer software cannot do that.
Chime sounds from http://www. Freesound. Org/people/urupin/sounds/122056 mixed together with noise, bit depth decreased, and all reversed. And then some other effects applied.
Analog crt tv electronic static noise audio from when i was experimenting with circuit bending and synthesizers earlier this year. Recorded on an iphone using the ios voice memo app. No post-production.
The sample are mixed and processed. The fade-in/stopping done by filters & the noises, the full sample done by glitching, granulize & adding more sounds: doorclosing, drive starting, -stopping & dooropening/drive ending.
I recorded making differnt kind of noises with leaves and other plant parts to use them as a base to create some monster-like sounds using distortion and filters. Recorded with a tascam dr-22wl and cut with ardour.