ModBox 3.2.2

BeepBox is an online tool for sketching and sharing chiptune melodies. ModBox expands the world of BeepBox into a whole new realm!

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. BeepBox 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 BeepBox 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 BeepBox 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
Q: Go to Custom Song Settings
[ ]: 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.

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

ModBox has many more features. Enabling Advanced Settings via the Prefernces Menu unlocks much more of Modbox's features!

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. Modded Beepbox is developed by Quirby64, Theepicosity, Fillygroove, and DARE.

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

Neither John Nesky, BeepBox, nor the Modded BeepBox Dev Team assume responsibility for any copyrighted material played on BeepBox. No songs are ever received, recorded, or distributed by BeepBox or Moded Beepbox's servers. The Modbox Dev Team is not liable for any problems that may occur when your song gets updated in this beta and this beta alone. All song data is contained in the URL after the hash (#) mark, and BeepBox running inside your browser converts that data into sound wavs.

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!

Shared on Twitter:

Modded BeepBox Changelog

Go here to see the original Modded BeepBox and it's changelog for 1.x updates.

Go here to see the 2.0 version of Modded BeepBox and it's changelog for 2.x updates.

Go here to see Modebox Beta.

Go here for more information on Beepbox and Modded Beepbox.

ModBox 3.0 Updates

[2018, July 28][S] 3.0.0
- Added Themes, Advanced Settings, 3 random sliders, lots of new waves from Sandbox, Custom Harmony, Octave Offset, new edit song menu, fades, instant-mute buttons and Advanced Color Schemes.
- Updated to the latest Beepbox updates with FM and 8 channels.
- Increased max Reverb and Tempo.
- Re-added the Custom Song Size hotkey.
- Fixed many, many bugs.

[2018, Aug. 4][OfRe] 3.0.1
- Modbox now supports 16 channels.

[2018, Aug. 13][QF] 3.0.2
- Update to ModBox color scheme.

[2018, Aug. 15][U] 3.0.3
- Added new unique Piano Theme.
- Quick and temporary fix when exporting to midi.

[2018, Oct. 21][U] 3.1.0
- Added more options to custom harmony, new FM envelopes, a "cut" tool, a Song Data menu, mixing styles, and a new spooky filter that can be disabled in preferences.
- Added custom harmony and octave offset in drums and the volume slider in FM.
- Modbox has merged with Sandbox, adding new FM options, Archives, and a new slider.
- Changed the instant mute button into an actual button, and made advanced settings a preference option.
- Fixed many, many more bugs, (about 3 times as many!) including the detune slider and custom harmony union.

[2019, Jan. 14][U] 3.2.0
- Added panning and two new themes, FrozenOver and Halloween (Super Special Thanks to John Nesky, creator of BeepBox for helping me get this running!! -DARE)
- Fixed exporting to .json

[2019, Jan. 26][OfRe] 3.2.1
- Fixed the changelogs

[2019, Feb 5.][U] 3.2.2
- Changed .mid to .midi
- Added a 3.0 archive
- Notes in chip and drums also have numbers
- Added the modbox description to mobile
- Fixed problems with older songs