I literally registered for the forums so I could make this request. Anything I try to play with on this app sounds... well, silly when doing it with folk/celtic/irish music. And while they added modal options, they don't work right. They go all funky with the key signiture.
Add in a tin/penny whistle and a bodhrán and it would be a done deal. As it is now, all I can really use is the nylon guitar and I have to silence the drums because they sound ridiculous with my harp.