Luka hanging her chords and toys is pleasingly tidy. However, I do question the lab setup up here. The oscilloscope shows a square wave, which are painful to listen too, and not how you would power a vibrator (external power supply is rare for them anyway, as the unbalance motor would either need a rectifier or VFD, or only run at mains frequency) so she's presumably measuring the inside of Miku, which opens a lot of questions about Vocaloid's genital physiology.
good point(s). my first thought, maybe the square wave is the modulation pattern? that could theoretically be a sig gen, as there's not the 4+ BNC plugs you usually see on a scope. maybe the rabbit has it's own internal PSU, but accepts different inputs for modulating the vibration pattern, a la a music-synchronized sex toy, though that wouldn't explain the headphones being plugged into the same.