Roland SP-404MKII Creative Sampler and Effector - Manual (Page 81)

Combining Samples to Create a Pattern (PATTERN SEQUENCER)
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2. Press the bank [A/F]–[E/J] buttons.
Select a bank to delete.
3. Press the [VALUE] knob.
The patterns in the selected bank are deleted.
You can’t restore a pad’s pattern after it has been deleted.
If you want to keep your data or make sure it doesn’t get accidentally modified, we recommend that you follow the steps in
“ Backing up Your Data (BACKUP) (P.120)” to create regular backups.