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

Train your ears and improve your mixing skills with Quiztones, the frequency ear training app for amateur and professional audio engineers, producers and musicians.

Quiztones uses tones and frequency-altered noise and musical loops (including source material from your own music library) to train your ears and help develop more acute listening and frequency recognition skills.

Quiztones will...

• Sharpen your ears & frequency recognition skills
• Improve your mixing and EQ chops
• Prevent noise and frequency buildup in your mixes & recordings
• Eliminate the need to sweep for frequencies

Quiztones cleverly uses quizzes to engage users in training exercises. Each EQ quiz includes four trainers:

• Easy frequency boost (+10 dB)
• Hard frequency boost (+5 dB)
• Hard frequency cut (-10 dB)
• Expert frequency boost – 1/3 octave (available via Quiztones Pro in-app purchase)

New in 1.7: Train your ears to identify boost & cut between 1-16dB with our new Gain Level Comparison quizzes! These new quizzes are available via the Quiztones Pro in-app purchase.

Quizzes included in version 1.7:

• Music Library
• Tones
• Pink Noise
• Piano
• Bass
• Drums
• Strings
• Strings 2
• Orchestra
• Electric Bass
• Upright Bass
• Female Vocals
• Electric Guitar
• Acoustic Guitar

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Testimonials:

"Turns out, this app offers everything offered in that Berklee class of mine… in an app!"

- Damian Erskine, No Treble

The Quiztones app is far and away the best app I've purchased. It's an incredible tool for all audio engineers and musicians ... My mixing has improved by leaps and bounds after just a few weeks with Quiztones.

- Austin McAllister

A professional Audio Engineer of 10 years, I've come across many ear training devices, blind tests, and software. This app is TOPS! Highly recommended! The developers are serious about what they do. You will not be disappointed!

- Joel Avery