QUOTE (Sawfooter @ Jul 15 2008, 05:02 PM)

Well that makes sense.... But I Switch harmonica when the songs change keys so how do you play in A with a C/G anglo?? That sounds a bit difficult??
Depends. On a 30 button C/G, you have an accidental row, which includes C# and G#. It is a bit trickier in the fingering and you don't have as many options for each note as you do with the keys of C or G, but it can be done.
I suppose you could, in theory, play something in C# major; but there the fingering would get pretty hairy and your fingers would likely be braided in a few measures. I think a C/G 30 button can comfortably play F, C, G, and D (with their associated minors, dorians, myxomolydians (sp?) or whatnot), and with some effort can add Eb and A. 3 or more flats or 4 or more sharps would likely be increasingly difficult and limited. With each accidental the options for cross-row techniques or alternate fingerings decrease.
A 20 button Anglo will only play in C or G (and associated modes) because it only has F#'s for accidentals.
There are G/D, D/A, F/C, Eb/Bb and other keyed 30 button Anglos out there; G/D is a popular option it seems.
The push/pull thing is almost exactly like a harmonica so that would be pretty intuitive for you I would think. Concertinas and harmonicas are both based on the Richter scale. One person here did point out that he tended to alter his breathing when playing the concertina to match the notes, as if he were still huffing and puffing on a harmonica.