Ah yes, the DTS CD. While many like SACD and some DVD-AUDIO, the DTS CD gets little love. I have a few of them. Steely Dan’s “ Gaucho “ is my favorite. Back then, they had to be played using digital output in a disc player to a DTS equipped processor/receiver. The DVD-AUDIO players could decode and output audio from the multichannel analog outputs to multichannel analog inputs or HDMI in later players. One needed to start them at reasonable volume because sometimes loud noise was output initially as the player located the DTS signal. This varied with disc, player and processor/receiver.