How can i change the default sound lib?

[LovelyA72]

It's me again, your Chinese friend 19wichen
I want to ask a question about convert mid file to mptm file.
OpenMPT will automatic convert the mid file to mptm format and put samples from GS.dls(Windows's default sound library) as instrument.
I want to ask: I put some of my own sf2 file into OpenMPT (Such as DuanGeXing). How can i make it become my default sound library when MPT convert the midi file?
Thanks!

[Saga Musix]

You need to replace the MIDI Library in the tree view, which is by default mapped entirely to GM.DLS.
Note that you can also use SF2 files which have the same name as the MID file for song-specific instruments (so put e.g. foo.sf2 next to foo.mid in the same folder).