The SWR has an amazing Overdrive and can also be used as a 5w practice amp on its own.I managed to get that beauty from flea bay for £200
The Trace apparently was a close proximity to the Alembic FX1 but I’ve not played one of those yet.
I just know it’s a beautiful sound and with the “deep” switch engaged it’s bowel moving.
Remember to take note of the input sensitivity of any preamps you purchase the SWR is low at .775v
That’s why I bought the Crown you can adjust the Sensitivity from .775v - 1.4v
It won’t damage anything running a .775 at 1.4 on the amp but you won’t get the full power out it and will need to crank the gain and volume up which can cause distortion.
I can recommend the crown XLS 2502 for a 2U power amp
or the Powersoft LD 2004 for a 1U
I love the ability to change sounds easily and pick up new pre amps reasonably cheaply