The G-1000 allows you to layer sounds in a variety of ways. Use the following
steps to layer two Tones across the entire keyboard:

1) Press GM/GS MODE so it is off.
2) Press RIGHT UPPER 1 under Keyboard Mode so it is lit.
3) Press RIGHT UPPER 2 under Keyboard Mode so it is lit.
4) Press WHOLE RIGHT under Keyboard Mode so it is lit.