Hi,

On 01.09.2010 17:01, pierlu wrote:

so you mean that if i plug them both together, the second one will automatically transmit and receive note on and off messages on midi channel 17?

exactly. (assuming they are both connected via USB, the word "together" maybe was not the right word...)

Is PD that does this conversion automatically?

yes, this numbering exists only inside pd. Note that you have to set up pd so it can use 2 devices in the 'media' menu.

Martin