re: I-go-bananas said "The filters are also very rudimentary (although, the new bob~ one looks more promising). Of course it is possible to write your own with the filter primitives, but it's hard work."
bob~ is great, you do know about the 2nd outlet to vcf~ don't you? I find myself time and time again choosing vcf~ to get a certain sound over bob~ and my own ~fexpr cookbook filters.