Korg A1 Owner's Manual page 27

Checking the effect size
Selecting a new effect
4. Turn the double function edit control (B-H), below the effect to be replaced,
fully counterclockwise.
The effect path "----" appears on the display and the effect box size is displayed in the
upper right portion off he display. Make sure to check the size of the effect box before
replacing the effect.
Turning the "E" double function edit control for the Plate effect ("PL1") fully
counterclockwise shows that the fourth effect box is Size 1.
5. Select 3 new effect by slowly turning the desired double function edit
control clockwise.
The effect path display is replaced by the names of effects, whose sizes fit the effect
box size 1 to 9, which appear en the screen one by one.
You can scroll through the effects one at a time by pressing the UP/DOWN keys.
6. Continue entering new effects by repeating steps 4 and 5.
Sea the separate "EFFECTS AND PARAMETERS" for the sizes of the various effects.
Refer to the "Chain List" to check effect box "sizes" for each Chain.
Effect Path Effect Size