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It's important to understand the MIC ATTN settings in the PMD 620 and 661 are not pads, they actually alter the gain of the preamp. Always use the least amount of gain that will allow you to get to 0dBFS, this means using the largest negative number (i.e. -18dB or -24dB). This does 2 things, it lowers noise and distortion plus it prevent input overload or "brickwalling". It's OK to set the PMD 620 or 661 record level control at 10 as long as your meters never show an over load. This is preferred to using a higher gain setting( smaller negative number) and setting the record level control to 6. If you cannot get enough signal level, then and only then switch to the next highest gain setting (i.e. -12dB)