After downloading the app and looking at the signals it generates for free on my oscilloscope I was enthusiastic. The app looks fantastic, is feature rich and feels like a wellmade and useful tool. Because of this I bought the whole in app purchases package for 8,99€. Unfortunately some waveforms, namely square and sawtooth have serious a serious ringing like characteristic which makes them pretty much unusable. If this issues was fixed I would have no problem giving this 5 stars!