yes you can put music
you can't normally but if you purchase the TTDS card you can download a special music playing program but the sound isn't very good, i have one.
Yes, TTDS / R4DS are illegal, but ONLY if you use them for "ROM"s. You can apparently use them for other kinds of media, like music.
you do the same as if your puting moonshell on a ttds
yes it will work with any ttds any game that contains Pokemon except the game boy versions of Pokemon will not work
ttdsi means top toy dsi
http://www.modpiiri.com/asennusohjeet/dstt/dstt117.zip TTDS English v.1.17 MENU
If you want to play gba games on a ttds then you need a gba emulator compatible for the ttds but i don't think there is one.
Yes.
ds hobro
nope
You can get them off the internet, just search buy ttds. Also it depends where you live but there might be some shops around that sell them
go to amazon.com