Had a few minutes with this iOS synth app and its one of the best “acid” synths ala Roland 303 style although it doesn’t behave or look like one. Comes with a good X Y pad for low and high pass filters that can also be triggered with the devices gyroscope and is really good fun.
LFOs on this app are pretty responsive and it has a good sequencer. Ships with Audiocopy so no worries on exporting recordings. Tempted to give this one 7-10 because the sound engine is not as tight as I would like and the dials are a little fiddly, but for £1.99 it’s worth it