Regarding the flexibility. It depends on which version you have. The original version had a very wide range on the filters. Later and current versions this was reduced which does make it easier to use.
I do have a demo of a Wal with the 01 in it.
https://m.soundcloud.com/acguitars
Ralph Wal is the track.
However I need to stress that copying the Wal was never really the intention. That could have been done but I was looking for my own thing and I think we achieved that.
Also have to point out I have been ploughing this lonely track for nearly 20 years and while filter preamps are more popular now with a few more options it has been hard and expensive work flying the flag for them over the years.
We have further refined it over the years and continue to do so but that is mainly focused on the DFM. But has not excluded the 01. Work on something with John East at the moment. At the end of the day copying Wal is not my goal. Yes it is a huge influence but I want an ACG identity don’t want to be the guy that does the Wal knock offs I will leave that to others.