cool idea, i played accordion in my childhood for several years. But gave it up. Mine had a pretty nice deep bass, maybe u can sample some pitches from pretty short to 10 sec long the long samples with falling steady rising dynamics. This could be a pretty nice raw sample for making reeces and deep background soundcapes in an sampler. I read noisia made some basses by sampling vacuum cleaner.
I know this samplepack would get a bit big MB wise, so maybe u make firstly some probe samples at standard bass pitch to take a look which lengths/pitches might be useful depending on ur accordion/mic
damn we have no accordion smilie, looking forward to mangle ur samples
I will be taking samples from my mates car today (doors,wipers, engine etc) and where possible I'll take recordings of different velocities to map within the sampler. It's for a uni assignment but if anyone is interested in them I'll upload these too