Transistor Bass?
Transistor Bass is a subtractive synthesizer in the style of the legendary Roland TB303™ Bassline synthesizer, but also enhances the concept by offering a number of tweaks not found in the original hardware, together with a guitar distortion, FX and a modern sequencer for fast editing of your bassline patterns.
Instantly available are the classic tweakable controls such as cutoff, resonance, envelope mod and decay essential for that acid sound.
Uniquely you can smoothly mix a blend of the square and saw waveforms for greater timbre variations instead of being limited to one or the other at a time.
You can adjust the pulse width of the square waveform or even modulate it with a built in LFO. The minimum decay parameter alows you to change the filter envelope ranger furthur than normal. The high pass parameter, normally fixed in the original hardware, is adjustable here to greatly change the character of the low frequencies.
The TB303™ was often combined with a guitar pedal to create a distorted version of the acid sound.
Transistor Bass includes a perfectly matched distortion effect built in, that can be used for subtle saturation to screaming overdrive effects.
Delay and reverb enable you to place the sound within the space you need. Apply a short slap back delay, huge cathedral reverberation or anything in between.
http://www.image-line.com/plugins/Transistor+Bass/https://youtu.be/-pFYx8QwkLI