Fine, but it can be hard to indicate tone of voice in a tweet (or a text).

In the 1920s, Han-Nom was replaced by Vietnamese alphabet, a Latin-based script that indicates tone.

All other systems utilize diacritics or numbers to indicate tone.

When tone is represented, acute accent over the vowel is typically used to indicate high tone.

(However, the Chinese military has found pinyin to be sufficient to telegraph military communications, even without indicating tone.)

A dial on the front of the cam indicates the current resonance frequency and musical tone of the instrument.

Dungan, a variety of Mandarin spoken in Central Asia, has, since 1927, been written in orthographies that do not indicate tone.

Marking letters are placed at the end of syllables to indicate tone.

There is also a set of three diacritics that are used to indicate tone.

Wade-Giles uses superscript numbers to indicate tone, and Pinyin uses diacritics.