Great!
After an intense search for a successor of the BlueFire app, I realized its reincarnation is Røde rec - solid as the origin, simple and 90% fitting to my needs... cannot verify the minus-reviews of other users. I ran it on an iphone 4s@7 and On an IPadMini@6... made large test recordings of >1hour. Works.
The last star remains for separate input channel volume control.
The app is one of the few ones which allows for stereo rec via usb! I use it for tape recording digital conversions: perfect! Worth to bye the full version.
snder about
RØDE Rec LE