with your metaphor (machinery, conveyer belt etc) you’d be remiss not to add sound i’m afraid. For me, sound is one of the things that FLASH exemplefies in the new media–creative use of sound.
would’nt you say that one noticing the lack of sound draws attention to the fact that it may be worthwhile to add it to your site?
I think forgetting sound in flash is akin to using straight bitmap grapics…it defeats the purpose.