By default, the SP-555's A Bank of samples and A Bank of patterns are protected. To turn off protection:
1. Turn off the SP-555.
2. While holding CANCEL, turn on the power.
To turn protection for Bank A back on:
1. Turn off the SP-555.
2. While holding BANK A and REMAIN, turn on the power.
To protect all banks:
1. Turn off the SP-555.
2. While holding REMAIN, turn on the power.
1. Turn off the SP-555.
2. While holding CANCEL, turn on the power.
To turn protection for Bank A back on:
1. Turn off the SP-555.
2. While holding BANK A and REMAIN, turn on the power.
To protect all banks:
1. Turn off the SP-555.
2. While holding REMAIN, turn on the power.