Using loadFile

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You have the function loadFile definition in your code
var loadFile func(slotNum int, fp string) int32
purego.RegisterLibFunc(&loadFile, lib, "sv_load")
But there is no use for it. It's better to rewrite the function LoadFileFromPath like this

func (s *SunvoxChannel) LoadFileFromPath(filepath string) error {
	loaded := loadFile(s.Index, filepath)
	if loaded != 0 {
		return errors.New(fmt.Sprintf("error loading sunvox data: %d", loaded))
	}
	s.filename = filepath
	return nil
}