Option Remove delay after "play sound () until done" allowing songs to loop seamlessly
when flag clicked play sound (start) until done forever { play sound (loop) until done }
should be no delay between start and loop or loop and loop with this option enabled without any custom extensions that make it unloadable on vanilla scratch
the thing is also that scripts running are always aligned to frame increments, and that can't really be fixed.
So I think seamless looping be added to the compiler (remove any frame delays), it's impossible using scratch's interpreter I know that the MP3 format has a limitation that a tiny delay is added, so I use .ogg disguised as .mp3 to remove the tiny delay before the sound. Even if the script is run in a no-screen-refresh custom block it's still not seamless
we seriously need a way to remove delay.
There are some tricks you can do that will even work in normal Scratch, like instead of using play until done, use start sound then a wait block thats slightly shorter than the sound's length.
I think the wait block is rounded to the nearest 1/30th of a second so it's impossible to loop a song where the loop's duration isn't a multiple of 1/30.