Looking for a way to play sound clips at a theater or sporting events, as a DJ, or at other events? Don’t want to lug a computer around with you? With Sound Byte, the so-called "cart machine" used at radio stations in the past is now available for the iPad, iPhone and iPod Touch.

Whether you're programming a radio show or amateur podcast, adding spice to the commentary at a local sporting event, controlling sound effects for a theater production, or simply organizing your personal playlist, Sound Byte lets you manage and control playback of your audio files.

Sound Byte is perfect for:

Radio, podcast and TV productions - have ads, announcements, songs and sound effects
at your fingertips.
Theater Productions - play any sound effect on cue.
Sports Events - jazz up the commentary for your home team with sound effects each time they score.

Sound Byte supports up to 20 racks of carts, or up to 1500 recordings total (420 on the iPhone/iPod). You can set the number of racks in use, so you don’t have to deal with empty, unused racks.

Using Sound Byte is easy - just tap a cart, and playback of the audio file begins.

You can set the title of each cart, as well as the background color. Optionally, you can have the app automatically change cart colors based on their state: empty, loaded, playing, and already played. Carts can also be numbered if you wish, and you can mark carts with a bright red border to make them easier to find, to play next.

Fade in and out times can be set, as well as the cut in and cut out times, the playback volume, stereo pan, and rate. The volume of carts can be set while they are playing, and you can set the volume up to 200%, in case you have some recordings that are at too low of a level for normal playback.

Carts can be set to loop a specified number of times - great for sound effects!

Carts can be set to flash a user configured number of seconds before they finish playing, so you can get ready to play the next one.

Interactions between carts can also be controlled - touching a cart to start it can optionally cause currently playing carts to stop playback or fade out. You can even set carts up to play sequentially, so once one ends, the next one starts playing.

Carts that have been played can be marked as such, as well as disabled, if you only want to play a cart once. You can also log the name and time of played carts to a text file that you can copy back to your computer to view. This log can also be viewed from within the app.

Several sizes of carts are supported, so you can display fewer larger carts to make playback control even easier.

Sound Byte plays sound files from your Music Library. Note that sound files stored on iCloud cannot be played, they must be stored on your device. (iOS6 or later)

Sound Byte also plays sound files that you have installed in the Documents folder, which you can access via the iTunes app.

Note that the screenshots are for illustration only, so you can see how the app works. Sound Byte does not come with any sound files, you'll need to supply your own.

Please see for a full description of how to use the app.

Buy your copy of Sound Byte now, and get complete control over playback of your sound effects and other files.

What’s New

Version 1.6.0

This app has been updated by Apple to use the latest Apple signing certificate.

- Fixed a problem with the user interface slowing down when many carts have been loaded from the device music library.
- Cart volume can now be set above 100%.
- The cut out time can be set.
- Carts can be numbered.
- The log file can be viewed from within the app, as well as cleared.
- Carts can be set to flash N seconds before they finish, to alert the operator they are almost done playing.
- Carts can be set to play sequentially, when one finishes, the next to the right will start playing.
- The volume of playing carts can be changed by swiping up or down on the screen.
- Up to 20 racks now, and the number of racks can be configured.
- Carts can be marked with a bright red border by tapping twice with two fingers - to make carts that will be played shortly easier to find.
- The cart background color can optionally be set by state: grey when unassigned, yellow when assigned, green when playing, blue when previously played.

Ratings and Reviews

4.2 out of 5
119 Ratings

119 Ratings

DJ Dad9 ,

Very good, minor snags

Really like the Ap and building racks is sort of fun. It freezes up sometimes which makes me wonder if it will glitch in the middle of a sports event I’m DJing live. The other thing that would be nice is if you could easily insert a Ringtone, and not just a song. There are a lot of great ringtones out there that would be great to add. “Dilly Dilly!” Have yet to use it during a live game, but looking forward to it.
Will have to have a power cord as the backlit screen eats battery life, and will be sure to airplane mode the phone/texts. Don’t need those going off while I’m hooked up to the PA. Just meant to be constructive here. It’s a very good Ap. You’ll probably enjoy it and like the relative ease of use.

corkyzak ,

Worked great, best one I’ve used

Every so often I do sound effects for theatrical performances. I’ve tried and used a few others over the past few years - but this one is the best. I can stop looking now. You can change how many carts on a rack (for those not familiar with the pro terms - a cart is a “cartridge” which is a sound, a rack is a “page” of sounds). Came with the ability to have 20 racks with an adjustable number from 18 to 75 carts per rack. All kinds of adjustments - fade in, fade out, cut in, speed (adjustable from half to double speed) and more. This IS the one you want. Except you may want to get their bundle - great deal -includes function generator and more. And the support response was great.
This is my second year of using the app and it just gets better with each update. Love this thing.


Great. Hope for ongoing updates

Just what I was looking for to play songs at my sons hockey games when I run the clock. Allows me to set the cut in time so you can get to the main parts of the songs immediately for short stoppages such as offsides. Would love to see upgrades to the aesthetics and ease of use of the interface. The biggest upgrade that would use is the ability to use iCloud to sync carts and settings across devices and provide a backup.

I recently had to get a new iPhone and lost all of my songs cut in times and volume adjustments and have to set everything up all over again.

App Privacy

The developer, Black Cat Systems, has not provided details about its privacy practices and handling of data to Apple.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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