So, TriqTraq is not a "new" app - its been around since 2012. But theyve continued to update it and some new features like IAA and "Open In" capability caught my attention in Sept. 2014. The immediate thought I had upon loading the app and playing it was that this app "solves" a lot of the frustrations I had regarding iMaschine, which is an excellent beatbox/groove app that hogs up a ton of memory and leaves you with zero realistic options for exporting your patterns (no AB, IAA, or ACP).
TriqTraq, by contrast, is designed to get you to work quickly, and to export your beats any way you like. The onboard samples are surprisingly good, especially for an app that is $2.99 and just shy of 27 MB. But you can also import your own samples in a variety of ways, and save them as kits.
There are some criticisms you could make of the app - it does steer you towards traditional 4/4 EDM/Pop styles of music, and you can only program one instrument per step, though you can have tracks A through D playing different things on that step, so there are workarounds. But the app sounds great and makes it very convenient to craft simple grooves with the included beats, basses, and leads. Great effects and interface, too.
HouseOfHomuth about Triqtraq - Jam Sequencer