If you don’t have iMini it is right time to grab it from AppStore.
For the limited time for just 6.99$ (however in some countries it is still 9.99 but price should be reduced soon) you get great iPad synth which is the emulation of legendary vintage MiniMoog (actually is port of desktop VST) on iOS.
It is Audiobus ready with support of Virtual Midi so you can sequence it from your favorite DAW and record it via Audiobus.
The synth comes with several hundreds of presets made specially for this synth by famous sounddesigners.
And with programmable X/Y pads you can combine advantages of touch screen with legendary Moog sound.$9.99