(I posted in collab yesterday.)

I think I touched on magic being somewhat linked to knowledge some time back... Essentially it comes down to how well you observe (well, Claw observes) sound-phenomena, no? (As it so is that just seeing a fire allows you to make something that looks and behaves almost like fire, and the heat can cause purely natural fire to ignite atop of it.) Acoustic levitation and impact treatment, as well as the ability to cause remote precision-explosions in non-vacuum conditions (interference can both weaken and amplify a wave phenomenon ... make the waves interfere in a specific way after going through anything in between without causing any damage and you get a strong enough spike to make an explosion, and potentially a rather powerful one) are fairly unlikely to have noticed, but other things... That silence is just the lack of sound, that sound is reflected back as an echo that returns the faster the closer the surface, that rather loud noises really [i]hurt[/i] (and perhaps even someone who has gone deaf, had ears bleed, collapsed unconscious, or even died from a loud sound in his vicinity), noticed how you can feel vibrations in your chest with very low sounds, how glass cups might decide to "sing along" to the notes they themselves produce, how some things may break to sound, or how a loud sound can trigger an avalanche... Yeah. So he could technically replicate a very wide array of effects just by having figured out they occur by seeing, feeling, and hearing them. 
 - If he noticed that a thing decided to respond to a sound, and then increased the loudness out of sheer boredom, I'd assume said thing might still eventually explode, since the structure (though not the molecules ... the structure itself, since molecules are usually too high frequency to be identified as sounds; no living being can hear sonic water-vaporizers, for instance) is, after all, still subjected to its own frequency at extremely high volume.

(...It also doesn't take being consciously aware of the thing's structure for me to know when a tool I am holding will snap if I strain it just a marginal amount more. And as far as I am aware, I have been quite right in my conclusions - when it comes to things being destroyed when I ignore that feeling, anyway. Not only did I break a spade or two (well, it was two), but I also managed to make a high carbon steel knife abruptly explode into shrapnel one time. So ... yeah. If I warn you something will most likely break, it most likely [i]will.[/i])

And congratulations on being accepted, Jack! That's a good news indeed.

@Nessa: Wishing you good luck for tomorrow.