Just a heads up. If you have an iPad and fancy synths, but don't have iMS-20, you should grab it. It's awesomeness level borders on the ridiculous.
All but Gorillaz version of iElectribe since it comes bundled with a f*ck you if you use these sounds in your own work license.
Yea ims20 sounds great and really close to the real thing. But it's a PITA to actually make a track with it. I kinda stopped using it..But Korg really stepped up the game with Polysix, 2 synth parts each polyphonic (can do up to 4 voices as chords on the chaos pads for each one wich can make for some really cool stuff using the different scales etc) and one drum part with 8 or so available synths to create your drums. And this time you can actually record and use a decent sequencer, mixer and full automation for all of this, unlike ims20's old school sequencer thing. Lots of effects included of course.
Arrgh. That's what I look out for when buying music apps: restrictive licences. It important because many apps DON'T grant you an exclusive right to use all samples, sounds, etc. as you see fit. Even if you never plan on recording or performing with the app, it could inhibit your ability to share your work gratis.
I'll have to take a look at polysix. The main issue I have with ims-20 is that, like the im-20, it's monosymphonic. Still great for making purposefully early-synth sounding stuff (anyone know if it was used on "Speak and Spell" by Depeche Mode? 'cause I'm pretty sure I just about rxactly replicated a track)...hell, Deutche Americanishe Freudenskraft (sp? ) used it...that's pretty early. And if was good enough for KMFDM, well, ya know. My favorite GUI is still tabletop. It just about exactly replicates how you would set up physical machines, down to pluggin thing into one another in the correct order. Tabletop can actually help someone new to electronic music equipment understand the real, studio equipment.