IPhone app for USB preamp?

This won't work.

I think the USB implementation in the iPhone (and probably most other mobile phones) is USB client, but to use the interface you mentioned (which itself is a USB client) you need a USB host (like a computer USB interface). Very few devices can switch their USB role.

So no computer USB interface will work with an iPhone.

I got a cheap stereo infterface for an iPhone, but there is so much noise, that I prefer to record with the built-in microphone or the headset microphone in mono. The problem is, that the microphone is easily overdriven (i.e. when I try to record while playing in my big band) and the level control only works after the conversion, when the signal is already distorted. You might have luck to hack an old headset to attenuate the mic signal before it goes into the iPhone, but it's probably not worth the hassle.

Better get a cheaper dedicated flash-card audio recorder. It's probably cheaper and can record longer than a phone.

 

Yes, the problem is to be abble to adjust the input level.
I record my rehearsal on an Iphone with: Irig recorder (IK Multimedia) that let you adjust the input level. Even, There is a free version to try it. Garage Band also has that feature, but I prefer Irig whitch looks more simple to me.
Alain

 

Or they add it, but remove something else to sell both of them to the same person...

I often used the Tascam PCMrecorder that I got for free. Works nicely with the built-in mic, can be turned by 180 degree, so the microphone point to the front and could be locked. Unfortunately it only seems to work with Tascams interface for two channels.
Unfortunately it is not clear how low you can set the input without getting input distortion, so I have several recordings, that are OK on the level meter but sound distorted.

 

I'm happy that I could have helped a bit to find a solution for your problem.

If it works with both channels, please tell us which tablet you have used and how long the battery holds when recording (or how much percentage it goes down during the recording time).

 

There is a standard for simple (2-channel) audio for USB. Most modern computer operating systems have a built-in driver for that and immediately recognize such kind of interfaces. Either you need to switch to different audio input sound sorce (if possible at all) or it should work immediately. If neither of this is true, I doubt the have a (standard) audio driver in their system. I'm even not sure if it would be possible to install a driver on the tablet.

Maybe look around if there is any third party recording soultion available for Android tablet using the USB port at all. If not, I doubt you would find any driver you can use for recording purposes with the tablet.

Sorry for the misunderstanding.

 

Strange, but that's what happens with "open" software, every developer does his own with it and you cannot count on things being implemented.

So if we want to go out buying a tablet we should take a USB audio interface and some free android recording software with us to check if that works together...