The best part is those older toys with low batteries would have an extra creep to the voice because of the low voltage. We had one that sounded absolutely possessed by a devil. It was truly terrifying to hear that in the middle of the night :-D
https://danelectro.com/product/1960s-vintage-battery/
https://jhspedals.info/products/volture?srsltid=AU7gw4VF4W_4...
At least that's the story I've read online a few times about the bass sound on Sir Psycho Sexy having to do with the dying battery on the pedal.
And, of course, just a little bit before DSP and simulators become available (or feasible for mainstream availability), those of us who were playing as teenagers in the 90s often got weird sounds on account of trying to juice the last bit of the batteries in our pedals. I love it that some among the current generation of kids like to simulate tape hiss, dying batteries, and other things we'd suffer then :)