.. Some iOS apps are great to have if you already own an iPad. And some are worth buying an iPad for. Moog’s Model 15 Modular Synthesizer is firmly in the latter category. (We should note that it’s also available for the iPhone but the smaller screen may reduce enjoyment.) ..
So from a synthesiser we want the ability to sound analogue, but also there's the occasion need for digital for those classic silky bells. We need soft attacks and a rich and full sound. Additional effects are a bonus with a particular lust for rich tonal chorus types.