Round and warm, with a bit of bite.
Baba is a pure sine bass, low-passed and lifted in the low end, with a touch of FM that adds a short bell-like edge to each note. Play short notes for a bouncy line, or hold them and let them settle.

A round, warm sine bass with a little bell-like bite on top. Short notes bounce.
No MIDI keyboard? Play with your computer keys: bottom rows are the lower octave, top rows the higher one. Hold Shift to sustain. ← → octave, ↑ ↓ semitone.
Sine bass online
Baba is a pure sine bass, low-passed and lifted in the low end, with a touch of FM that adds a short bell-like edge to each note. Play short notes for a bouncy line, or hold them and let them settle.
On a velocity-sensitive MIDI keyboard, a soft touch gives a gentle thump and a firm one comes through louder. The arrow keys move the letter keys down into the deep notes where a bass belongs.
Synthesized on the spot, so there is nothing to download and no account to make. Record a groove and keep the WAV, which is made on your own device.