Roland SP-404MKII Creative Sampler and Effector - Manual (Page 27)

Playing Back Samples (SAMPLE MODE)
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Stopping All Sample Playback (STOP)
You can make all samples and patterns that are currently playing back stop.
1. Press the [EXIT] button quickly four times.
All samples and patterns that are playing back stop.
You can also press the [EXIT] button while holding down the [SHIFT] button to stop all samples and patterns that are playing
back.
Pausing the Sound of a Sample (PAUSE)
You can make samples that are currently playing back pause.
1. Hold down the [SHIFT] button and press the [HOLD] button.
All samples that are playing back pause.
2. Hold down the [SHIFT] button and press the [HOLD] button again to resume playback.
The samples resume playback.