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  • #: 205097
  • Price: $1.99 In Apple Store
  • Category: Music
  • Updated: 2008-10-23
  • Current Version: 1.0.1
  • 1.0.1
  • Size: 0.10 MB
  • Language: English
  • Seller: Jorge Castellanos
  • Requirements: Compatible with iPhone, iPod touch, and iPad. Requires iOS 2.0 or later
  • © 2008 Jorge Castellanos
  •  Add to Favorite apps



FMScreen turns the iPhone into a musical instrument: an FM Synthesizer. Play, improvise, compose. Imagine the Theremin's younger relative, only it fits in your pocket. Tap and slide your fingers on the iPod Touch/iPhone's screen to generate sounds, control their frequency, duration, timbre and amplitude.

An FM Synthesizer generates simple waveforms that interact to create complex sounds of varying timbre. The interaction with the screen of the iPhone allows controlling the frequency of a sine wave (carrier), and the the amount of modulation (richness of the sound). The amplitude/volume of the sound is controlled by the inclination of the iPhone /iPod itself.


- Tap on the screen: Sound on or off.

- Slide your finger along the length of the screen to control the carrier's frequency.

- Slide your finger along the width of the screen to control the index of modulation (richness of the sound).

- Tilt the phone sideways to dynamically change the volume.

- Pinch along the device's length to change the c/m ratio.

- Pinch along the device's width to set the active frequency range (4 - 6 octaves).

- Tap three fingers to display an octave grid and snap frequencies to the equal tempered chromatic scale.

iPhone Screenshots

FMScreen iPhone Screenshot 1

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Rated 4/5 based on 3 customer reviews.


5/5 stars


I never even thought of anything like this for the itouch/iPhone. This app awesome ! I will be using it in some songs of mine for sure. The interaction has a very responsive feel.

3/5 stars

Great idea

Great idea for an app. Great to understand the relationship between frequency and sound. Also a fun one to let a young kid play with :)

5/5 stars

A++ Gold Star!!!

This is a great application. The types of sounds you can create are near inifinite. Although you have to explore the app a bit, you discover what is is capable of doing: vibrato, volume control, carrier/modulator ratio, and grid mode (to name a few).

Although a little daunting at first, just read the instructions and play around with all the options for a while. You will not be dissapointed.


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The information may be outdated (2011-04-25 10:34:10). For actual information go to iTunes

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