Function paste_sfx 

pub fn paste_sfx(
    sfx: &mut [Sfx],
    records: &[Slotted<Sfx>],
    at: usize,
) -> PasteReport

SFX-editor paste: overwrite SFX slots from at with records, remapping each record’s custom-instrument note refs to the slots they land in. Records past slot 63 are dropped.