[so what size keyboard do i need to have a decent range?]:
that is the maddening thing about compact PAs. really, someone needs to get busy with a new design—it’s certainly doable. to wit:
to have a decent range for world folk music genres (classical & post-bepop jazz require more), you need a minimum of 34 keys on the treble side. 36 or 37 are better, but 34 will do it for most folk genres. less than 34, and you are going to go out of your mind with frustration. and for tango and paris musette, though you “can” manage with 34, 36 or 37 is vastly preferable. you can do irish on 34, though if you play flat, you won’t have the low F. on the bass side, for folk music, you can do it with 48 or 60 basses.
but there’s the rub—the 36 or 37 key PAs run about 18 pounds at a minimum, and the lightest 34 keys 15 pounds.
there are wonderful-sized small, compact PAs, but they have way fewer than the necessary 34. most have 24 or 26. 24/48, as in, 24 treble, 48 bass, is a wonderful compact PA size. but you can not adequately play irish tunes or any other music in more than a kiddie-widdie way on these.
the lightest i’ve seen would be the saltarelle clifden, which weighs in at about 14.5 pounds, for 35 treble and 60 bass. but it is ludicrously overpriced at list prices ranging from 3700 euro, forget dollars. button box lists at $4800.00 ludicrous, because the ads for this product nowhere specify hand-type reeds, which implies the reeds are factory/export quality, which means people are throwing their money away on the pretty wooden cabinet. alan kelly plays one, but i wonder, i do wonder, if it has custom reeds…same with jimmy keane and phil cunningham.
actually, this ad is the first and the sole i’ve ever seen that does say handmade reeds, though i would be insistent on verifying that. saltarelle’s diatonic button boxes have extremely resistant, stiff factory/export reeds, but this one clifden ad does say handmade: http://www.themusicroom-online.co.uk/product_info.php/manufacturers_id/40/products_id/260
http://www.youtube.com/watch?v=KpRFgBw-b9o (not sure if this is a salt or the castagnari one, which is heavier and even more expensive than the salt)
the world is crying out for a 10-12-pound compact PA with 34 keys and 48 basses. it could be done. but it has not been done.