[iPhone God App] It was found using the SoundCheck actually

iOS7 ready (iOS 3.x - iOS 7.x)

Here is the Ultimate SoundCheck Toolkit for your iPhone, iPad or iPod Touch and your ears.

-Check your current headphones, car stereo, mixer, PA, Soundcard, ....
-Check the headphones, car stereo, ... you are planning to buy
-Check any connected gear and speakers
-Is left and right connected proper ?
-Can your stereo play 20 Hz ?
-Can you hear 17 KHz ?
-Can your dog ;-)
-Check out if your stereo loudspeakers are connected in the right way
(Phase tests)
-Find resonance problems in your room
...


This is a professional toolkit but easy to use:
-Start it up
-Select the level
-Select any signal you like
-Click to start the signal (it will play until you stop it)
-The last used signal will be automatically selected when you restart the toolkit

Professional sounds (16 bit high quality and uncompressed)

This Toolkit includes all this signals:

1) Low Frequencies : 20Hz, 30Hz, 40Hz, 50Hz, 100Hz

2) Mid Frequencies: 1000Hz

3) High Frequencies: 4000Hz up to 20000Hz in 1000 Hz steps

4) Stereo check signals: Mono, Stereo, Left, Right

5) Phase test signals: Pink Noise, Pink Noise out of phase

6) Impuls test signals: Rhythm Mono, Rhythm Stereo

7) Sweep: 20Hz-20Khz

8) Deep Sweep: 20Hz - 200Hz


Warning:
High frequencies may not be audible by older users or by using some speakers/headphones - make sure NOT to rise the volume too far.

For iPhone users:
Activate the ringer tone with the switch on the left side of your iPhone in order to hear the sound.

For iPod touch users:
In order to use SoundCheck activate your system sounds via 'General-Sound Effects' set it to 'both' and turn up the volume 'Settings - Music - Volume Limit'.

Check our webpage to read the FAQ or send us an Email in case of any problems.

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New in version 1.5

Totally reworked version:
-Full compatibility with iPhone OS 4.x
-Totally new user interface
-additional signals:
Impulse, White Noise
60Hz, 200Hz, 400Hz, 800Hz, 2KHz
-Each signal can be played stereo, left only or right only
-Pause/Continue feature
-Inbuilt help system

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New in version 1.6
Better indication of currently playing sound