I'm searching up brain damage to see how I should play this. Neurocognitive deficits, monothematic delusions, amnesic-confabulatory syndrome... I can work with this. I can work with this indeed!
Precisely how I hoped it would happen. I could force a psychosis on you, but it's more fun for all involved to have you choose one you want to roleplay.
Can I generate noises from other places, only from the amulet, or from my body? If I can generate noises at a distance, how far, and does my level of control or power diminish? Can I generate complex sound, such as replicating Freddie Mercury's voice or playing orchestral music? Do I have to be wearing the amulet, or can I take it off and still generate noise? What if I'm wearing it outside my clothes so it's not touching my skin, or holding it in my hand, or I step on it (lightly)?
You've probably already determined this stuff, so:
1. Just from the amulet.
2. If you can imagine it. Complex sounds (ie, orchestral music) require more concentration, and it will only be as accurate as your memory of the sound.
3. It needs to be in contact with your skin. Or possibly other tissues, but you haven't determined a safe way to test if it can be used if in contact with only, say, your muscles.
Once these important questions have been answered, head to the costume shop and look for anything that looks like a generic superheroing outfit (don't want to be too identifiable). Can't be too hard to find around these parts, right? Pay in cash.
The only problem with this request is the "generic" idea. A "generic" superhero who actually fought crime might actually stand out due to the lack of an average hero anywhere.
In other words, I'd appreciate a bit more specificity. You could easily get, say, a Superman costume, or a Flash costume, or a Fantastic Four costume, or even an Iron Man costume (*Not intended for use as actual armor), or with a bit more effort something like one of those but with different patterns or colors.