The result is that a tone may be realized at a certain pitch over a short stretch of speech shifts downward, then continues at its new level and then shifts downward again until the end of the prosodic contour is reached, at which point the pitch resets.
As in many languages, a low tone starts out and remains at the bottom of the speaker's range.
The phonetic terracing effect in Twi of an alternating series of high and mid tones.
The phonetic terracing effect in Twi of an alternating series of high and low tones.
From tables 2 and 3, it can be imagined that the tone sequences high-low-high and high-mid-high may be difficult for a non-native speaker to distinguish.