Pd on macOS uses portmidi for it's backend and portmidi, like portaudio, does not support device hot plugging.

I imagine it works on Linux using the alsamidi backend instead...

On Nov 30, 2018, at 5:49 AM, pd-list-request@lists.iem.at wrote:

Date: Thu, 29 Nov 2018 23:29:41 +0100 From: Simon Iten <itensimon@gmail.com mailto:itensimon@gmail.com> To: Ingo <ingo@miamiwave.com mailto:ingo@miamiwave.com> Cc: Jaime Oliver <jaime.oliver2@gmail.com mailto:jaime.oliver2@gmail.com>, Pd-List <pd-list@lists.iem.at mailto:pd-list@lists.iem.at> Subject: Re: [PD] Recognizing USB MIDI interfaces on Pd 0.48.1 (Debian 9.5) Message-ID: <C3B84F2E-B351-44B8-9208-D1F49F5B12FF@gmail.com mailto:C3B84F2E-B351-44B8-9208-D1F49F5B12FF@gmail.com> Content-Type: text/plain; charset="utf-8"

on osx at least you had to restart pd for new midi devices to work since “ages”… (not talking about extended)

Dan Wilcox @danomatika http://twitter.com/danomatika danomatika.com http://danomatika.com/ robotcowboy.com http://robotcowboy.com/