Did you find this?: http://arduino.cc/en/Tutorial/Midi Surely that is the starting point. I typically use the main Google search and use arduino as the first word. For example, I go to www.google.com and search on: arduino midi which returns over 1 million hits. There is absolutely several spot-on answers to your questions there in the first several pages of hits.
If you go to http://arduino.cc/forum/ and scroll down you will see "Forum 2005-2010 (read only)" where there is yet more content than here in the current version. I assure you that there are MANY spot-on discussions. Work on your search skills.
Thanks a lot, yes I have seen the tutorial... I suppose I can search together all the small components of codes and snippets and ideas and hardware and so on, but I was simply wondering if ever someone built a midi file player for Arduino. Yet I have NOT seen any. I have seen solutions, where midi-notes are hardcoded into the source, I have seen a lot of midi-out, have seen the USB-To-Midi thing and so on.
But I have NOT seen a Arduino project yet, that reads a midi-file from anywhere and simply send the midi-data to an out... And believe me, I have been searching quite a lot.
Yes, the Midi tutorial is a good starting point, and the lcd-display-shield-examples are a good starting point too and so are the examples for reading from an sd-card. But all in all these are all good starting point, so all in all they are a "start".
I am quite sure, that when digging into the field it would take me a month or so to build up a complete player based on an Arduino, but I appreciate it very much, if already someone else sweat for me... :grin:
Nevertheless, if I cannot find any solutions, I will try my own in some future...
Thanks a lot! Martin...