intro master repeat open some measures with DOUBLE BARS first ending master repeat close second ending
When the DOUBLE BARS are replaced with single bars, the software follows the flow direction. If I retain the double bars, the repeat is done many times and jumps to an unintended measure.
DOUBLE BARS should have no effect on playback as it is merely a cosmetic indicator of some sectional change in a piece. https://en.wikipedia.org/wiki/Bar_(music)