Swamped

The notion of scrambling the mechanical servants' perception and making an escape out into the corridor enters your mind. Assuming your Host does not use similar echolocation to perceive, it might force them out of hiding to prevent your escape, getting you the face-to-face meeting you desire... although you'd be playing your only card with no guarantee of success, and probably make a poor first impression to boot.

It'd be best if you could gather some idea of the layout of this place, if only so you'd know how foolish or fruitful any dash into the corridor might be. You'd just need some time to tinker with an echolocator of your own.

To get the Host off your back and give you time to work out a device and test it out to map your surroundings, write back and ask for a functional voice box. And if pressed, send a non-functional mashup of components with no explanation... if the Host complains that it doesn't work, well, it was only a prototype after all.