Trying to find specific music "app" for iPad Hello,

I don't have an iPad. But I might get one, and so I am researching specific "apps" that I would want, if I get one. Here is the main type of thing I want:→[More:]

A virtual recording device, multi-track, that contains midi instrument sounds, and a nice selection of them.

right now I use ableton on a PC. I don't need to reproduce ableton. It does much much more than I need, and often is quite unwieldy. For example, ableton is particularly strong for live "dj"'ing, which I do not do at all.

Here is what I do, and want I'd want an iPad "app" to do (notice I cannot yet say or type "app"; I guess that would have to change should I actually buy an iPad):

I want at least 4-track capability. I want three of those to be midi-capable, with built-in sounds. Ableton has hundreds (no, thousands) of instrument sounds that you just cut and paste into the midi tracks, and then you use either the computer keyboard (primitive method) or a midi controller to place the actual notes of the track.

I also want at least one, preferably two, audio tracks. In ableton I stick an alpha lexicon interface into the USB port of my PC and a regular mike into the interface and that is how I (and my singing partner) get our vocals onto our audio tracks.

Then I want a little mixing board-type thing, but it doesn't have to be very sophisticated. I use the absolute basics of ableton to construct little songs, and ignore about 95% of what ableton has to offer, and that is fine with me.

So -- that's the type of software application I am looking for, for iPad. I've done some searching around various websites, but I'm just wondering if anybody here knows any nice websites that might shorten my search through the hundreds of reviews of thousands of these software app...um, these APPS.

Thanks!