Difference between loud and aloud

[kris]

Test No. errors/inter-5 "Talk about it later", question 6

Can you please not talk so aloud because I can assure you I'm not really deaf.

(a) Can
(b) not talk
(c) aloud
(d) deaf

Test No. errors/inter-5 "Talk about it later", answer 6

Can you please not talk so loud because I can assure you I'm not really deaf.

Correct entry: loud
The error was: (c) aloud

You have found the error and your entry is correct.
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I guessed the answer right, but I don't understand why "aloud" is not right here. Thank you!

[Torsten]

Aloud simply means that you speak in an audible voice. For example you can read a text without speaking. This means you are not reading aloud. So, aloud would not work in this context.
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Test Of English for International Communication
TOEIC Preparation & TOEIC Vocabulary