Slarmoo's Box

Slarmoo's Box is a mod of Ultrabox that aims to advance Beepbox's capabilities (see the FAQ for more information).
UltraBox is a mod first envisioned by Neptendo that was made possible by Main, with help from contributing community members.
It takes elements from most of the beepbox mods available (see credits) and puts them in one convenient package.

If you have any questions, please visit the FAQ.

BeepBox is a passion project, and will always be free to use. If you find it valuable and have the means, please feel free to show your gratitude to the original creator of Beepbox here:

Instructions

You can add or remove notes by clicking on the gray rows at the top. Slarmoo's Box 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 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.

Slarmoo's Box can play several rows of patterns simultaneously, and each row has its own set of patterns. Most rows can play melodies or harmonies, but the bottom row is for drums.

All song data is contained in 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!

When Slarmoo's Box has focus (click on its interface above), you can use these keyboard shortcuts:

  • Spacebar: play or pause the song
  • Shift Spacebar: play from mouse location
  • Z: undo, Y or Shift Z: redo
  • C: copy pattern from selection
  • V: paste pattern into selection
  • X: cut pattern
  • 0-9: assign pattern number to selection
  • Arrows: move selection
  • Ctrl & Arrows: move selected channel up or down
  • [ ]: move playhead backward or forward one bar
  • F/H: move to First or Highlighted pattern
  • Shift F: move to start of loop
  • Shift & Drag: select part of a pattern
  • Enter: add a new bar after currently selected one
  • Shift Enter: add a new bar before currently selected one
  • Backspace: delete currently selected bar
  • Ctrl Enter: add channel
  • Ctrl Backspace: delete currently selected channel
  • D: duplicate a pattern
  • N: create a new blank pattern
  • +/-: move notes up or down
  • Shift & +/-: move notes up or down one octave
  • A: select entire song
  • Shift A: select current channel
  • Shift ~: new blank song
  • B: loop bar
  • R: random preset
  • Shift R: random instrument
  • Shift P: open song player
  • Alt E: open/close all envelope dropdowns
  • Alt F: open/close all fm dropdowns
If you have channel muting enabled:
  • S: Solo/unsolo a channel
  • M (or shift S): Mute/unmute a channel
  • Shift M: Mute/unmute entire song
And if you're in the song player:
  • Spacebar: play or pause the song
  • [ ]: move playhead backward or forward one bar
  • F: move to first pattern
  • L: toggle loop
  • Z/+/-: toggle zoom
  • Ctrl E/P: return to editor
  • Ctrl S: shorten song player link
  • C: copy link

These are just a few shortcuts, check Slarmoo's Box's edit menu for more!

In the note 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 add more notes to be played simultaneously, which is called a chord.

ADVANCED: Drag vertically from an existing note to bend its pitch, or drag vertically from above or below the note to adjust its volume. You can perform fine volume adjustment if you hold Control while doing this!

ADVANCED: Click and drag on the pattern grid to make a selection. You can then press C/V to mass copy/paste parts of your song.

Slarmoo's Box has many more features. Try playing with the buttons and menus on the right side to find out what it can do! You can also click on the label next to each option for a description of what it does. Some features are hard to find anywhere though - for example, if your song has any modulator channels, you can hold Ctrl or Shift while the song is playing to record the movement of sliders directly! If you want to learn more tips, tricks, and best practices though, see below.

Want to see what people have made with BeepBox? Songs that were shared on Twitter prior to 2023-05-22 can now be browsed in this interactive archive! Additionally, there's an active BeepBox Discord where you can share songs and ask questions!

About

Slarmoo's Box is a mod of BeepBox developed by Slarmoo. The easiest way to contact the developers is via the Beepbox Discord.

Slarmoo's Box does not claim ownership over songs created with it, so original songs belong to their authors.

Neither Slarmoo's Box nor its creators assume responsibility for any copyrighted material played on Slarmoo's Box. No songs are ever received, recorded, or distributed by Slarmoo's Box's servers. All song data is contained in the URL after the hash (#) mark, and Slarmoo's Box running inside your browser converts that data into sound waves.

Slarmoo's Box does not collect, track, or share any user data.

You can download an offline version of UltraBox to use when you don't have access to the internet. The features are missing Slarmoo's Box's, but are otherwise the same.

You can download and use the source code under the MIT license. The original BeepBox source code by John Nesky can be found here.

The patch notes of Slarmoo's Box are available here.