The theremin and sci-fi are like two peas in a pod. Once the instrument became available to purchase, build, and learn on a somewhat wider scale, it was only a matter of time before it became the sound of the unknown in the world of sci-fi film scores. It sounds like a voice echoing out through space, like warbly electronic transmissions signaling an alien presence. Hermmann’s creative use of the instrument in this iconic score would go on to influence not only contemporary film composers like Danny Elfman, but also set the precedent for an entire genre of film which would blend score and sound design into one eery whole.
I tend to use a faster attack, but I’m not crushing those transients with a ton of compression, so I still keep the dynamics in my mix. If I found I was killing the transients too much and there was no excitement in my mix, I would probably make it a slower attack setting.