Are you thinking about iOS Scaler?

I suspect many problems will raise with Android

To have a mini-DAW working in my Android smartphone I had to do buy a special cable, and another headset because the level of my great Sennheiser ME-2 is too low

But at the end I came up against a brick wall because there is no way in Android to increase the mic volume, so my recordings (tried yesterday) have too much noise

AFAIK, apart to a few very high-end Android devices, the others are unsuitable for musical production