Silla 's instructions were simply to walk around on the set , as Itt 's voice ( provided by sound engineer Tony Magro ) was dubbed in post-production .
Silla often had difficulty seeing through the costume during shooting .
Silla 's instructions were simply to walk around on the set , as Itt 's voice ( provided by sound engineer Tony Magro ) was dubbed in post-production , but he often had difficulty seeing through the costume during shooting .