Seems like if you tried to use it as a weapon, you'd strike something with it and it'd vibrate hard enough to make it painful to hold...

You know why tuning forks are made with two tines, right?

yea but then again a blade shakeingwhile in an monster can cause more damage. yet it owudl probly focus more on stabs then actual slashing

It's not going to damage the monster, you'll have to trust me. That's not how fluid acoustics work. You'll end up using the target's body as a fulcrum point and intensifying the vibration in the opposed arm for a short period of time before it's absorbed, primarily by the monster's body and your hand.

I'm inclined to think that the extra mass of a solid blade would be better for cleaving body parts off of targets with a high muscle density or light armor.