SMG

The SMG file format is a form of sequenced audio used in Shin Megami Tensei: Nocturne. An SMG file can be separated into 3 parts: the sequence itself, a sample bank, and header data which contains information such as the sample rate and sample offsets. Samples are in VAG audio and can be extracted with vgmtrans ad turned into a soundfont, though it's very difficult to get an actual output from this. At the time of writing, modifying these files is very hit or miss, as many of them contain links to other SMGs that, when broken, cause the file to not play at all.