Hi everybody.
I've thought about making a repatcher arduino shield following the schematics from openmusiclabs.com, but the pd patch that control the repatcher only works with audio signal through [matrix~].
Is there any alternative to [matrix~], but for control messages?
Thanks a lot!

Yes, but it's a little different because Pd's message system allows for more flexibility than using audio signals (you can't make lists of signals). You would using [mtx_mul] to do the actually multiplication that [matrix~] does, but unlike [matrix~] you don't have multiple inlets and outlets for each value. Instead, you have to pack them into their own matrix using [matrix]. It should be a single column vector if you're looking to emulate the signal version exactly. Take a good look at [matrix]'s helpfile to see how to do that. These are all part of the iem_matrix library, btw.

Ok, thank you very much Maelstorm.