Darth Maul says very little in the movie. Around 50 words or so.

We thought we'd give him just a little more to say.

Transcript

{flashback scene of Trade Federation Headquarters control room}
Rune Haako: Sir, the Jedi. It rooks rike they're... pranning to search the loom.
Nute Gunray: That settles it. Destloy their ship and flood the loom with knockout gas. We'll intellogate them once we have them lestrained.
Trade Federation bridge crew member: Uh, sir... they're attacking our droids. They're coming up to the blidge!
Nute Gunray: Seal the blidge.
Rune Haako: They're still coming through!
Nute Gunray: <sigh> Send in the droidekas.
Darth Maul: {voiceover} "Soon after you split, Queen Amidala called the Feds..."
Queen Amidala: Enough of this pretence, Viceroy.
Queen Amidala: I'm aware the Chancellor's Ambassadors are with you now, and that you have been commanded to reach a—
Nute Gunray: Jedi spies, you mean. Beware, Your Highness... the Naboo have gone too far this time.
Queen Amidala: We would never do anything without the approval of the Senate. You assume too much.
Nute Gunray: We will see.
Obi-Wan: {non-flashback} Losing sensation in my arms. Not to mention my ears...