CrixusCrucifixus

So if two or more llplaysound or lltriggersound is initiated from the same script in a row, will it double the sound or will they play slightly out of sync from eachother? I've noticed many gestures trigger the same sound dozens of times to make it extra loud, but sounds triggered in prims dont always seem to happen in the same instance

Triggering a sound from a prim using llplaysound or lltriggersound, does the sound always emit from the center of the prim, no matter how big it is? Is there a technical chart anywhere of how prim size influences how loud or how far a sound is heard from the prim center? (I've noticed a sound emitted from a prim thats 0.1x0.1x0.1 sounds softer even at volume 1.0 than a sound emitted from a prim 64x64x64 at volume 1.0 from the same distance from the center of the prim). If I "slice" a prim to 50% of its original size, will the sound now be loudest at the edge of the visible part of the prim?

OK then how do I create an always on particle with a texture of my choosing?

OK then can i make an alpha image into particles that always face the camera?

I've seen objects inworld that look like a transparent cube with an alpha image texture on one side of it that the image face of the prim is always facing the camera no matter where you walk around. How do I achieve this?