They play different buzzing sounds with varying volume, help?

This also happens frequently.

Same, they have access to any sound from any files from gmod

I think i found a fix. Go into lambda player voice options, some of the dir for some may be randomengine. For these, replace them with lambdaplayers/vo/x, replace the x with the thing it will use the voicelines for. Ex, conquestiondir, change the x with conquestion, then do these for every dir that goes to randomengine, then update lambda data. This should fix it using random voice lines from other addons.