ミョンミョンいう音の謎がやっと解けた気がするけど、長い間チップチュ－ンやってる人にはやっぱり常識的なノウハウなのかな

These frog-like sounds are made by them jumping from 1 octave below when they start.
I'm glad I was able to reproduce that kind of sound without using PCM.
May be Common technique in retro game songwriting?

those earthbound sounds are grade A choice. lovely song