One more puzzle piece, gleaned from the dCS remote codes guide, posted here. It does indeed look like the Rossini supports 3 distinct remote codes for sleep, wake, and toggle sleep/wake. So I assume the Solution DAC happens to use the same remote code as the dCS code for toggle sleep/wake (which doesn’t seem to work for the Vivaldi Clock)? I’m still perplexed, however, that the sleep/wake remote codes for the Rossini and Vivaldi Clock are different, and yet the Universal Remote sleep/wakes them together on 2-second press.