DR-550, DR-550MKII: Clearing a Pattern
Any user pattern (A Bank) in the Boss DR-550/MKII can be erased from memory, which allows a new pattern to be recorded in its place. B Bank patterns are preset and cannot be erased. Use the following procedure to clear a pattern from Bank A:
1. Hold SHIFT and press PAD 6 [PATTERN EDIT].
2. Use the numeric pads to select the desired pattern.
3. Hold SHIFT and press numeric pad 3 [CLEAR], then press ACC [ENTER].
NOTE: This will clear the pattern and erase any pattern that may previously exist.