DR-670: Checking the ROM Version April 11, 2023 06:21 Updated Follow Use the following procedure to view the current ROM version of the DR-670: 1. Power on while holding REC and ZERO on the numeric keypad. Related articles DR-670: Pattern Play back. DR-670: Technical Specifications AD-5: Optional Microphone Stand Mount AC-3: Recommended Power Supply AC-2: Recommended Power Supply