This tool converts rests or notes to beat slashes (a purely visual marker; see attached image).
In jazz and popular music, passages are often notated with slash noteheads that indicate no specific pitch and show no rhythm.
Depending on the content, this might indicate an improvised solo and accompaniment pattern to be devised by the player,
or a suggestion to continue in the style of previously notated passage.
The NWC rests, notes or chords are uninportant, provided that their durations are multiples of 1/4.
Assumes font User 1 being MusicDingsSans or MusicDingsSerif with the same size of the standard NWC2STDA.
N.B. Instead of hidden rests up in the sky I preferred headless, muted, stemless 1/4 notes because in the editor you can actually see their presence.
(Edited: I forgot to attach the tool!)