i think the mother32 would be a little redundant in that set up. just another analog voice. it’s cool adn sounds good and the sequencer is nice but you could add another flavor to your set up w/just a digital oscillator or complex oscillator. it would give you something not present there… unless you’re using the ipad for synth stuff to. there’s some good synth choices for th eipad these days…
but a used cylonix cyclebox II w/expander is around $350 if you look. add a make noise optomix and maths and you’ll have tons of sound design options. or something like a Piston Honda MKIII or wait for the hertz donut MKIII which will be out in a month or two… for morphing FM oscillator awesomeness. you could sequence it all from your A4.
you don’t have to fall into gas w/just that one row case. but smartly planned you can expand your sound design options and really add something special to the sound palette there.