This is the sound of an lrad (long range acoustic device). I managed to create this sound with a basic sample from nch tone generator and a few days of processing in goldwave.
Variable speed on main trigger. 4-step shift register made with sample and hold modules. Looping envelopes with varying speed. The sample and hold shift register does not preserve pitch frequency very well.
Closed hi-hat. I sampled all the sounds from my 1980's boss dr-220e dr. Rhythm drum machine, directly into my tascam interface, into logic pro, no processing, for your sampling pleasure. Enjoy the retro beats!.