This really made me consider getting volca sample. I find anything having to do with organizing files on ios to be a pain!
If i'd bite i'd go for the 99euro version. I tried the demo and multi-sampled my system-1. A little bulky with small windows not using full screen but it worked.

What's been holding me back from buying a volca sample has been the transfer of samples. Too much work and i won't do it.. and for the volca to be worth the price i will have be wanting to do it - otherwise it would just be a rompler instead of a trompler(tm) (transfer-rompler)

that said.. a volca sample isn't THAT far away from an electribe S ... damn these days when we're so spoiled with options!