Guys, just want you to know something else.
This works without a cab.
Let me explain... my bass sounds are sorta bi-amped. I always use the Tube Pre [without cab block] as the pristine channel with the treble sucked out of it, and also differing bass amps [with cab block] with bass removed, for any crunch or treble in the sound.
I sorta thought...well if I'm using the Tube Pre as the bass/basis for the preset, why not see if the curves would work without a cab and it did!
I ended up using Recto Large as it gave this huge, warm, big bottom end. I selected this in isolation.
Then I auditioned curves for the bass amp with a cab block, listening to the top end detail and then made the final choice for the bass amp, running both amp blocks together. I chose the Greenbacks. The bass amp is a Citrus Bass 200.
Now I've had more time to play with it, this is a ground-breaking feature, well done Cliff. Last night I used the Wrecker Express into Leon's LT TV Mix 2, with the Hipower curve. nice results.
It any of you like to use an Amp block as a Drive block [i.e. disabling power amp modelling], perhaps this might give you something else you can experiment with,