A friend of mine knows Bill, and I asked him your question.
Here is his reply:
"Bill is not terribly involved with music right now...he used to constantly play at the various hotels in Palm Springs....now he's involved in the writing of his autobiography and other personal pursuits, taking up every bit of his time to the max, so to speak. He's a sweet and wonderful guy."
I hope this answers your question.
Also, here are some Bill Marx related links I thought you might find interesting: