nevertheless you can get some interesting 'acid like' sounds from other machines. actually all mono synths with nice screaming filters will do the trick.
but if you want to go the software route; in ableton you can use the analog for this kind of stuff. set up a saw / square wave as osc. then add a tiny, tiny amount of white noise for the dirt. make the synth monophonic, and set it to legato. then glide to taste. a 24db low pass filter (18db would be better but can't be done with the analog in ableton is i recall correctly). then some filter envelope, play around with the settings on it.
what i really like to do is setup 2 oscs and send them both to different filters (osc 1 to filter 1 and osc 2 to filter 2). then configure one with a normal low pass filter. and the other one for some screaming sounds, use a formant filter, f6 or f12. lower the amp on the 'screamer'
to get the right sound you might want to use some plugs after the analog synth. try chaining a bunch of distorters after each other, with mild settings. this way you can get more dynamic results and make it less dull and digital sounding. for example, use a saturator, vinyl distortion and overdrive chained...
then it's always nice to do some poly rhythmic or whatever it's called, just set the loop length of the piano roll to something like 6 or 14 steps and rock on
edit: wtf, i read your question wrong... but maybe somebody will enjoy this info
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