In majority of cases, mid to smf conversion is searched by users that need to convert MIDI audio between the standard (.midi) format and the less common Standard MIDI format (.smf) content.
Your best option how to handle such exports is to use tools that are focused on MIDI audio, for example various music notation tools, such as the free MuseScore composition software.
The very same should be also doable with audio editors aimed at samples, banks and music composition formats, for example Awave Studio. Standard multimedia converters in this case are poor choice as these are designed for standard audio content and not instrumental music.