Text: Simple seems to have extra line breaks

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Fonts define a leading (i.e. line spacing rule) because each one can have different heights to their descenders (parts of characters that fall below the baseline). Often, text layout software allows adjustment of leading, but not Text:Simple filter. You can use CSS in the Text:HTML filter.

Demo video - 1 clip with 25 text filters!

The best way to achieve that is to use Overlay HTML and click the WebVfx Javascript extension checkbox. It creates a document that is setup for vertical scrolling credits. The Text filter is limited to 512 bytes after variable substitution. The number of letters that corresponds to depends on UTF-8 encoding, but using the basic latin character set, it will be 511. Furthermore, CSS has letter-spacing, word-spacing, and line-height.