Sorry for confusion. This should clear it up. Compliments from Matt:

There is a really good set of FAQ entries for PG Music products. Click on Support at the top of this page.

Here's your answer, from the FAQ:

http://www.pgmusic.com/techfaq28.htm#85

A lot of them are remnants from early versions. The two to know are .SGU and .MGU. When you enter only chords, it's .SGU. When you then add a melody, it gets saved as .MGU.


BIAB – 2025, Reaper (current), i7-12700F Processor, 32GB DDR4-3200MHz RAM, Motu Audio Express 6x6 - My SoundCloud (Tip: No need to create a SC account to hear music - just hit ESC ).