A must have!!

I have all the top synths for iOS and its hard to pick one as a favorite but if I could only have one synth loaded and had to choose it would be BS-16 without a doubt. It can cover everything by itself with the right sound fonts. I use a program on the PC called Extreme Sample Converter and can convert any sample from my EMU and Akai sample librarys with the click of a button.
Honestly this should get the top iOS synth award.

Analogluvr about bismark bs-16i