Just for @PotatoDogg to show that nothing is impossible in software :-) ( https://scratch.mit.edu/projects/115797375/#comments-61943845 )
Quick hack. To do this really well I'ld need to replace 'timer' with the alternative timer from https://scratch.mit.edu/projects/58656772/ which would allow me to pause the timer and restart it from the frozen value. But apart from losing a little of the music, this works well enough.