The Softone arrived. I'm listening initially with the provided Sovteks. It's so different from the Manley, more rhythmic, more driving, but less silky, for sure. It had a larger soundstage but sounded thinner. The Manley felt more coherent but less defined while the Model 4 rocked a little harder, which I liked it. I figured it would sound even better with other tubes. I have some to try and some to buy.
When I'd done some AI searches, it said I should put the Musical Fidelity A1 in Direct mode (pre bypass) and set the volume knob at 10-12 o'clock and use the Zrock to set the system volume. So, I did all that and it was different. Less nervous energy and more depth. After listening a bit, I wondered about the HIGH MC setting since I have a high output MC. I listened to LA Woman on MM and then listened again with the Softone on High MC. I had to lower the volume, but it sounded great. Then I read the instructions and they have a table that shows that I should be using the MM setting with the cartridge. But why'd it sound so good?
@lalitk A friend suggested I trade in the two cartridges I have: The Hana SH and Benz ACE H and get the ML. The Hana has less than 3 hours of use. The ML looks like it would be used with the High MC setting (I'm assuming that > 100 ohms means I would choose the 100 ohm setting and accept I'm on the edge.) I do have an pair of extra speakers and some cables I want to sell as well, so that would cover that expense handily. From what I've read it sounds like a great cartridge.
@pindac My excursion is about to make a detour!

