Very cool app, BUT...
This is a REALLY cool app (one of the best in my opinion - functionality, sound quality, design for 5+ “stars”), but it has A LOT of bugs with old IPhones (for example 5s/6). I use my old IPhones for musical creative, but old hardware unfortunately just can’t work with this app, even with max buffer size and max delay - only preamp and cab, with no power amp and pedals (but even it has mini bugs too).