I had a similar problem installing Lenny on an IBM ThinkPad 600 Model 2645-51U, which also has a built-in Crystal Semiconductor CS4237B sound chip. You might want to check out my web site, http://www.wowway.com/~zlinuxman/tp600.htm, to see how I handled the problem. One thing in particular that I noticed is that you blacklisted snd-cs4232, which is good, but you did not blacklist snd-wavefront, which is bad. You need to blacklist snd-wavefront too. There are many other sound tips in there too, including how to get the FM synthesizer to work. Hope this helps.
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