teletype studies 5: mismatched image & description

[iioflow]

(section: "dolphin and seagull" example)

according to tts5.md, line 218, script two is supposed to "Ramp down CV 4". but that script in tts5.png uses CV D, so it will never get turned off. CV 4 level always remains high. either the text in tts5.md needs to be changed to CV D, or the image needs to be updated to CV 4.

[GoneCaving]

The variable D defaults to have value=4. So the description is correct, if slightly less clear than it could be. Is it worth updating the description? If not, then this issue could be closed.