- Live
- Bass synth
- Sequencer
AXIOM B-1
A bass synth that plays a line the moment you open it.
AXIOM B-1 is a free monophonic bass synthesizer and step sequencer that runs in your browser. Press play, press a key to pick the root, and the whole bass line moves to it.
Free. No sign-up. Opens in a new tab. Works best in Chrome or Edge, and also runs on phones and tablets.

Make a bass line in a minute
- Tap the pageBrowsers keep sound off until you interact with a page, so tap or click once.
- Press PLAYOr press the Space bar. A bass line starts.
- Pick the keyPress a letter key (the bottom row, Z to M, works like piano keys) or click the on-screen piano. The line moves to that note.
- Change itTry other sounds, click steps on or off, or press the dice for a random sound or a random line.
What is inside
Trap to acid to dub
Factory sounds in many styles. Each one comes with its own set of 16 bass lines with names like MAIN, OFFBEAT, SLIDES, BREAK and FILL.
Random sounds and lines
Roll a random sub, 808, acid, reese, wobble, funk or FM bass, or a brand new random line. Save the ones you like.
Steps, notes and velocity
16 steps with a note grid, accent, slide, gate and a velocity lane, plus swing and glide.
Three oscillators and effects
Seven tabs of knobs: oscillators, FM and noise, filter, LFO, distortion, delay and reverb.
Capture loops and launch them
Make loops in the DJ / LOOP section and trigger them from the pads along the bottom.
MIDI and network sync
Learn MIDI controls, play it from a MIDI keyboard in Chrome or Edge, and sync with other devices.
Ready to play?
It opens in a new tab.
Launch the bass synth ↗