Here are my notes that lead to embarking on major revision 3 ...
I love my TS-9DX on bass. It has a killer just barely overdriven sound, and the tone blends
perfectly with a clean bass sound, retaining great dynamic sensitivity. I use the standard TS-9 setting at full gain with tone behind center.
But I also want a crunchier, more electronic sounding distortion sometimes.
I tried a new Guv'nor and it sounded really lame on bass, especially compared to my TS-9. It was just this cheap sounding fuzzy sound at high gain, and at lower gain it has absolutely no dynamic sensitivity. The EQ is OK, but the clipping stinks.
A DS-1 I just got here for $20 sounds WAY better than the guv'nor. Still not very sensitive for in-between sounds, but it has a great wall of gain sound, and sounds really good when both it and the TS-9 are on (TS-9 first). So I have 3 sounds. Tube breakup sound from the TS-9, grindy crunch from the RAT, full freakout with both. All of it buffered and blended with my barge so I keep all my lows! Really cools sounds.
I just returned the Guv and got a Keeley RAT

Planning to use the RAT the same way I'm using the DS-1, but hopefully with even better tone and a stronger, more dynamic in-between crunch sound from the rat.