Roland SP-404MK Reference Manual page 37

Playing Back Samples (SAMPLE MODE)
Playing Back Multiple Pads at the Same Time (PAD LINK GROUPS)
The PAD LINK GROUPS function lets you group multiple pads (up to four) into one group. By setting a group ahead of
time, you can make all the pads in the group play back just by operating a single pad within that group.
You can also register up to 10 groups (A‒J).
1
Hold down the [SHIFT] button and press the pad [7].
The PAD LINK GROUPS screen appears.
2
Turn the [VALUE] knob to select the group (A-J).
3
Press pads [1]‒[16] to select the samples you want to include in the group.
4
To finish making setting, press the [EXIT] button.
5
Press one of the pads that you set in the group.
All the pads in the group play back at the same time.