Audio Damage, Inc. released their 13th iOS port today with ADverb2! This reverb promises to be CPU efficient, so it won't bog down your iPad when you load it up with some thick synths! Sadly, there are no demos yet.
ADverb2 iTunes Description:ADverb2 is an accurate model of a vintage digital plate reverb rack unit from the 80s, with a few modern tricks up its sleeve. From short, thick, rich reverbs ideal for drums on up to incredibly long heavily chorused, echoey spaces perfect for ambient music, ADverb2 is an excellent addition to your sonic toolkit.
ADverb2 works as a stand-alone effect, with Inter-App Audio, but we recommend its use as an AUv3 plugin in a host that supports the format like Beatmaker 3, AUM, Cubasis, GarageBand, etc.
» Simple-to-use reverb settings, with pre-delay, time, and size, plus an extensive filtering section to shape the reverb tail.
» Logical vintage-style user interface, vector-based for resizability and future-proofing.
» XML-based cross-platform preset manager, with copy and paste. (You can even move presets between the iOS version and the desktop version with Handoff.)
» Optimized reverb algorithm for low CPU load.
Update: Doug Woods from thesoundtestroom brings us a much needed demo!