When loading samples, Renoise seems to be adding extra sound?

I loaded an 8-bit percussion sample into Renoise (I’ve listened to it with other programs), but when I load it into Renoise and test it using the keyboard, there’s… extra sound? I want to get rid of it, but don’t know where to start. It’s a buzzing sound of sorts, changes with the note (I am no expert in the physics of sound; I’m used to producing music acoustically). This is driving me nuts.

Fixed it! Had to load a .xm file so it’d recognize it as 8-bit audio, but it’s been done.