During the Aleste title screen, press 24 times on either the left or right cursor key to enter the soundtest mode.
With the cursor up and down you can choose between PSG and FM-PAC.
Tip
Watch endings
Start Children Wars then when asked to enter your name, push CTRL+STOP to break. Then execute RUN"KATI.END" to see the winning/RUN"MAKE.END" for the losing/RUN"HIKI.END" for the draw ending.