also there's no problem buying longer ones and cutting them to size... you may lose a pin or 2 though... often the 40pin lengths are only a little bit more expensive than 8 pin or 10 pin... pitch is usually 2.54mm... mouser, tayda, rme, farrell all regularly stocck them...
"some of the best base-level info to remember can be found in Jim's sigfile" @Lugia
Utility modules are the dull polish that makes the shiny modules actually shine!!!
sound sources < sound modifiers < modulation sources < utilities