Thanks everyone for the tips, I'll take a look at these modules. I think with the latest firmware the nerdseq can generate complex envelopes and the two sample tracks can act as oscillators too.
I was also thinking about the various ways to trigger the sampler, I could buy the 16 triggers expander for the nerdseq but I also wanted to hear some opinions about alternatives that require less drum programming (I like programming drums but I 'm curious about using other methods as well).