Roland SP-404MKII Creative Sampler and Effector - Manual (Page 70)

Combining Samples to Create a Pattern (PATTERN SEQUENCER)
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8. Press the [SUB PAD] button.
Sampling begins when the selected pattern chain starts playing back.
If you decide to cancel sampling, press the [EXIT] button.
When pattern chain repeat is set to “REPEAT Off”, sampling ends at the same time as pattern chain playback ends.
9. To exit sampling, press the [REC] button.
The sample is saved to the pad.