If you already have an iPad and an audio interface, iOS is a great option. Drambo, Synthmaster 2 and Twin 3 are my goto synths, but there are many more. You could also route your Digitone and A4 into iOS and do some mastering.

Depending on your “performance workflow” you may want to choose a different host for iOS synth plugins. If seamless transitions between your tracks is important, you may want to buy AUM or Loopy Pro to host AUv3 plugins and then use program change messages to switch between them when you switch tracks on your A4/Digitone. Drambo can also host AUv3 plugins but it has some limitations when it comes to performing with it as an AUv3 host that may matter to you.

Overall iOS can have a bit of a learning curve but also has a lot of great options and can function as halfway experience between laptop and hardware.

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