Sandbox 1.4.5

Sandbox is an online tool for sketching and sharing chiptune melodies. It was based off of Modded BeepBox, which is a mod for BeepBox, an online tool for sketching and sharing chiptune melodies.

All song data is packaged into the URL at the top of your browser. When you make changes to the song, the URL is updated to reflect your changes. When you are satisfied with your song, just copy and paste the URL to save and share your song!


You can add or remove notes by clicking on the gray rows at the top. Sandbox automatically plays the notes out loud for you. Try it!

Notes go into patterns, and you can edit one pattern at a time. Those numbered boxes at the bottom of the editor are the different patterns you can edit. Click the other boxes to move to a different part of the song, or click the arrows on the currently selected box to swap which pattern is played during that part of the song.

There are four rows of patterns that SandBox can play simultaneously, and each row has its own set of patterns. The first three rows can play melodies and the bottom row is for "drums".

The purple loop underneath the numbered boxes controls which part of the song is currently repeating. Move the loop to listen to a different part of the song, or drag the ends to expand the loop to include the whole song.

When SandBox has focus (click on its interface above), you can use these keyboard shortcuts:

Spacebar: Pause or Resume
Z: Undo
Y or Shift Z: Redo
C: Copy the current pattern
V: Paste the current pattern
[ ]: Move the playhead backward and forward
Arrow Keys: Change which bar is selected
1-8: Reassign a pattern to the currently selected bar

In the pattern editor, you can click and drag horizontally on a note to adjust its duration. You can also click above or below an existing note to enable a rapid arpeggio/trill effect, oscillating between two or more simultaneous notes.

ADVANCED: Drag vertically from an existing note to bend its pitch, or drag vertically from above or below the note to adjust its volume.

SandBox has many more features. Try playing with the buttons and menus on the right side to find out what it can do!

Need some inspiration? Check out some of these songs that other people have posted on Twitter!


BeepBox is developed by John Nesky, also known as @shaktool. SandBox is developed by Parad0xGamer and Fillygroove.

SandBox, Modded BeepBox, and BeepBox do not claim ownership over songs created with it, so original songs belong to their authors.

Neither John Nesky, BeepBox, or SandBox assume responsibility for any copyrighted material played on BeepBox. No songs are ever received, recorded, or distributed by BeepBox's servers. All song data is contained in the URL after the hash (#) mark, and BeepBox running inside your browser converts that data into sound waves.

You can download an offline Flash version of BeepBox (right click and select "Save As...") to use when you don't have access to the internet. The features are otherwise the same. You can open BeepBoxOffline.swf in a browser tab to run it, or you can install a Flash Projector to run swf files without a browser.

You can download and use the source code under the MIT license. In particular, you can use the synth code as demonstrated here to play BeepBox songs in your own Flash or JavaScript projects!

Sandbox Changelog

Jun. 15, 2017: 1.0.0 - First version.

Jun. 15, 2017: 1.0.1 - Changed the color pallet and removed some things.

Jun. 15, 2017: 1.0.2 - 3 new waves and 1 new scale.

Nov. 5, 2017: 1.1.0 - SandBox is back, after a nearly 5 month hiatus! Added Hard scale, Added "Highest" and "Lowest" keys, Added 3 new waves, Adjusted the volume of Unnamed 3, and Added "Fifths" rhythm.

Dec. 17, 2017: 1.1.1 - Changed the changelog, added "tremolo + vibrato" effect, and added a new chorus.

Jan. 2, 2018: 1.2.0 - Moved page to GitHub and updated to the latest BeepBox update.

Jan. 5, 2018: 1.2.1 - Added "shake" effect and added "Unnamed 7" wave.

Jan. 17, 2018: 1.2.2 - Changed color pallet and added a new wave.

Jan. 22, 2018: 1.2.3 - Added "normal minor" scale.

Jan. 26, 2018: 1.3.0 - Readded all the vanilla scales and waves, remade unnamed 5 (piccolo), and renamed all the previously unnamed things thanks to Fillygroove.

Jan. 26, 2018: 1.3.1 - Renamed "custom 1" to "lydian" and changed the dim color of the red channel.

Jan. 28, 2018: 1.3.2 - Added "overtone" filter, removed fifths rhythm, and added "nes pulse" wave.

Jan. 28, 2018: - Fixed a bug with rhythms.

Feb. 5, 2018: 1.3.3 - Added "saw bass" wave.

Feb. 6, 2018: 1.4.0 - For the first time ever, Sandbox has a new envelope! Added "spring" envelope, changed the maximum tempo and how the tempo slider works, added "faint" decay, and added "euphonium" and "shrill pulse" waves.

Feb. 7, 2018: 1.4.1 - Added "subdued" envelope, added "r-sawtooth" and "recorder" waves, and added "÷9", "÷12", and "÷24" rhythms.

Feb. 8, 2018: 1.4.2 - Added "harmonic" and "tenths" choruses, changed the way the "subdued" envelope sounds, added "tremolo delayed" effect, changed minimum beats per bar from 3 to 1, changed the volumes of several waves, and renamed "custom harmony" to "harmonic hum".

Feb. 9, 2018: 1.4.3 - Added "fluctuate" chorus and added a new drum channel.

Feb. 11, 2018: 1.4.4 - Now we have new drums! Awesome! Added "chime", "harsh", and "static" drums, changed maximum tempo from 20 to 11, and removed the twitter box.

Feb. 11, 2018: 1.4.5 - Added "narrow saw" wave, added "harmonic minor" scale, added the "recurve" chorus, slightly changed the shades of the color scheme, raised volumes of "chime" and "harsh" drums, and added a favicon.