25 odd years back I had a relatively low cost CD player for my otherwise pretty high end home Hi-Fi. I never liked the sound of it too much (and kind of assumed CDs didn't sound good), but one day I was recording something to cassette tape on a high end tape deck, and when I was checking levels flicked over to monitor the tape deck rather than the CD source. From that day on I only ever listened to CD output that had been through the preamp and low pass filter of the tape deck (but not through the tape heads of course). Still had all the audio highs and crispness, but was warmer, punchier, smoother, and I honestly think truer to the original.
I haven't tried the preamp in the Cab block, but it sounds to me like I need to, as it could achieve very similar things. Thanks for sharing OP!
Liam