It's worth noting that since you are using the DR-2D, you have the option of recording in DualMode and creating a "safe" copy at a lower level.
But this would only apply to using MicIn.
Wait! Before you rely on that function it is important to understand how it works. And why it's not really that useful for us.
DualMode wouldn't be beneficial unless he had the mic-input level set at least 6dB higher than 67/LOW, assuming he specified the additional dual file is recorded with 6dB lower gain. Likewise, he would have to set the mic input 12dB higher if he specified the lower level file at -12dB. If not, he would simply get two brickwalled recordings, one at a lower level than the other. DualMode can only accommodate for levels which are
within the good input range of the recorder. It is always necessary to make sure the recorder is not peaking with the mic input gain set no lower than 67/LOW. DualMode doesn't change that.
Complicating things, I'm not sure anyone has determined the dB value of each input level 'number' increment. There has been no confirmation that increasing the input level by one integer increases the sensitivity of the input by one decibel. Meaning it may not be as simple as setting the mic input gain to 73/LOW (67+6) when DualMode is set to -6dB, or to 79 when DualMode is set ot -12dB. Someone would need to test that.
As far as I'm concerned it's a useless feature for my uses. I'd rather just raise the level of the file by the same amount in my editing software after the fact, which achieves exactly the same result.
I bought these recorders
specifically for one of the Dual modes, but that's the dual-line mode (4ch) not for the lower level file copy feature which is pretty much worthless in regards to how most of us are using these recorders around here.