Yup, loads 2nd mission with NOD files.
EDIT: PC build works. Amiga not.
Scrolling is indeed not accurate, it was 4 times normal speed so I reverted it to original for v4. On faster WinUAE it may behave differently. I'll set it in the middle then with 2 times the normal speed.
https://mega.nz/file/Yss2EKKB#DDi8R1tyNUCQ0Js9RhyyQUftuZWroANXQJPULOjZRlw
Here scroll speed is with 2x multiplier
I can scroll music box just fine.
Regarding helicopters best solution is to build as many helipads as orcas.