thank you for trying it out! yeah, the microphone sometimes isn't detected when switching rooms, it's a stubborn problem that i couldn't quite figure out in time. thanks for the review :]
as for the waves? each wavefront is a GPUParticles2D node which uses a particle shader to disperse them in a "cone" shape. if you're curious i can share the code! if you meant sound effects as in noises those are just fmodeventemitters