BassLine is a virtual analog bass synthesizer with built-in step sequencer and on-board effects. It’s unique filter (the heart of any subtractive synth), a never self-oscillating, cascaded low-pass, allows you to produce the well known high-resonance filter sweeps, typical for vintage synths like the legendary TB-303.

Feature List:

Optional Features (“Plus” upgrade available via In App Purchase):

Designed for live performance, and with the capability to interchange audio data with other apps, BassLine is for anybody who's in creating electronic music, producer or deejay.
"Hours of Fun!!" by ElZangano
One of my favorite music apps. No turning knobs or switches to to change waveform or filters. Just move your finger around. Great job!
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Sound Sample

Available on the App Store
 

Documentation