Yes the random aspect of the sounds is absolutely crucial for me.
There's an element of surprise that triggers the sensation most strongly. The majority of the 'community' and it's videos are way to deliberate. The best feeling I generally get is a nice mellow relaxation. Very rarely do the tingles occur.
I'd even say watching ASMR videos on a fairly regular basis has made it less common for me to experience the sensation in every day life. I used to stumble into the feeling once a week maybe... Now almost never.
This is a shame because it's definitely one of the most pleasurable sensations I've experienced outside of drug use. When it comes on strong it's ecstacy.
