output only 1 channel of a mc signal

Dear maxers,

I am starting to explore MC possibilities and I am struggling to find the right object to extract one specific channel of a mc connection. I want to be able to choose dynamically which channel. And would prefer not to use [mc.unpack~] + [selector~] because I don't know how many channels my input connection will have!

Is there an object that I have been missing and which could do that? Something like [selector~] but that would allow me to have a mc connection at the input and one of the channel at the output…

Thank's for any pointer!

Benjamin