only initialize audiograb object if an audio block is in use
only initialize audiograb object if an audio block is in use

walterbender/turtleconfusion,walterbender/turtle3D,AlanJAS/turtleart,walterbender/turtleflags,walterbender/AmazonasTortuga,walterbender/turtleartmini,walterbender/turtleart