Hi!
I agree with MJ, since the introduction of core MIDI with iOS4 it has become easier and cheaper as a lot of interfaces will work. I was surprised that even my -small, but big for iPad- ESI M4U (4 in 4 out) works without the iPad complaining that the device is using too much energy -
Anyway, I like the App, it's very much 'what you see is what you get'; an uncluttered 6 track step sequencer, intended for drum units only (controls only one note per track!), perfect for the ND1/ND2!
You can get an impression of how the app works; you can download it for free, but note that it won't produce any sound on its own. There are other sequencer apps out there that can do a lot more; 'Genome', 'Cubasis' - but they are not cheap, some apps discussed here:
http://apps4idevices.com/categories/mid ... tml/page:1
Then your question about pads...
Indeed you'll need a ND2 to use the Nord Pad,
I haven't seen too many small units with pads intended just for MIDI:
- have read some negative stories about Alesis ControlPad, (can't play 2 pads at the same time!)
- I don't know about their PercPad/SamplePad, it is really cheap though... here, and on other forums people seem to like them..
- Of course there are the Yamaha DTX-multi12, and Roland SPD-Sx etc, which are good instruments with pads, -but much more expensive!
I wonder how much latency is an issue with MIDI pads, I think that pads directly connected with the unit have lower latency theoretically,
Good luck, have fun!
Albert