DS owner, here.
Maintaining multiple versions has been discussed at PS Audio's forum, as a "wouldn't it be nice." Ted Smith, the designer of the DAC, has said that it would be very difficult to do multiple versions due to a lack of... something... probably memory. Perhaps two could be maintained, at best.
Considering the improvements that I've heard over a couple of versions of firmware, I have no problem inserting an SD card, waiting 2-3 minutes, and listening. It's a bit more difficult to A/B, but the differences are usually so clear that it doesn't take long to make a decision on which FW version you'd like to settle.
Maintaining multiple versions has been discussed at PS Audio's forum, as a "wouldn't it be nice." Ted Smith, the designer of the DAC, has said that it would be very difficult to do multiple versions due to a lack of... something... probably memory. Perhaps two could be maintained, at best.
Considering the improvements that I've heard over a couple of versions of firmware, I have no problem inserting an SD card, waiting 2-3 minutes, and listening. It's a bit more difficult to A/B, but the differences are usually so clear that it doesn't take long to make a decision on which FW version you'd like to settle.