To answer all your questions, YES. I know alot of the cajun tunes and yes I can whistle or hum the notes. And of course, I've read Marc's writings and watched his videos. In fact, I shook his hand today and talked about accordions with him at the jam session. I picked up an Ariette off of the shelf and joined in. After a few songs of pecking and hunting for the notes, I found the notes and tunes came out of my accordion. Not perfect or anything like that but coherent music came out to accompaniment the band. Yes, accordion is lead but when you're learning it's a back seat until you get the notes right.
Do you have or know where I can get the notation on the D box?
In following Larry's suggestion to "add 1 letter to the c notes", it would be the E that becomes F sharp, and the B that becomes C sharp. I think Larry was highlighting that there is no F or C on a D box, as there is on a C box.
I could also import Dirk's video into the computer and speed it up a tad so it matches the pitch of the box. BUT, my uncle that has the thing hasn't show up with it yet so I'm not crossing fingers for it. If that falls through I'll just find a C box and not have to worry about speeding up the music.
Re: Martin D accordion/Free Tempo and Pitch Change Software
I've used Sound Forge to edit sound files. It will change tempo without changing pitch, change pitch with changing tempo, etc. It was affordable on eBay. But there's legitimate free software that does many of the same tasks:
Audacity is one of the open source projects, and is supposed to be reliable. I think it has an optional free mp3 encoder, too.
I've found this software great (1) to slow down fast licks, and (2) to place a song in a key I can play on my C or B-flat.