No not yet. It worked fine for awhile but no matter what my settings were it would record 128kbps mp2s
I use my old PMD670 to transfer DATs, and I just checked it and the factory default file format to write for analog stereo is MP2/128kbps, analog mono is MP3/32kbps, and Dig-In is MP2/128kbps, the one the OP keeps landing on with his.
By going into the menu and changing the setting for Dig-In to PCM, it will lock to the inbound PCM stream and match it's sample rate, 44.1k or 48k. Once PCM is selected, the next step is to engage the input lock to keep it on Dig-In/PCM.
It's been a while, but I think a recall that unless the input lock is engaged, the PMD670's input settings will revert back to the factory defaults each time the recorder is turned off and back on, when no batteries are loaded or power of some kind is feeding it while stored. Perhaps this could be the issue, and if so just using the input lock will keep it set where it needs to be.