Hi Gabriel (and everyone), Very cool to see this.
Not sure how helpful it is at this juncture, but I took a stab at designing metric modulation sign last summer: https://github.com/yoshiakionishi/lilypond-snippets/blob/main/DOCUMENT/metricModulationRegularFlag.ly And https://github.com/yoshiakionishi/lilypond-snippets/blob/main/DOCUMENT/metricmodulationStraightFlag.ly I made detailed comments on these two styles of metric modulations on pages 143 and 161 of the following PDF document: https://github.com/yoshiakionishi/lilypond-snippets/blob/main/DOCUMENT/YO_SNIPPETS_COOKBOOK_MASTER.pdf Just FYI... Yoshi -- -- -- Yoshiaki Onishi https://github.com/yoshiakionishi/lilypond-snippets
