I use it a lot for transitions between two parts. The random LFOs are great for that. For one programmed transition, you always end up with different variations based on those random LFOs.
I use it for Pads. The fact that you can have up to a 4-note Chord with only one Track (no polyphony involved) is really nice.
I use it for Arp Lead/Bass.
send it to me, i will show you lots of pics of it having a great time with my other a4 and the rest of the E family
you will soon become jealous, you will miss it and you will want it back - then and only then will you know you love it
Ok, so this was my first forum post I think, and I have to admit that it didn’t aged well : I repurchased an A4 a week ago and I love this thing.
Turns out I learned way more about synthesis in the last year and a half ; and now I just click with it, I can finally make it sound like I wanted ten years ago when I purchased my first one.
It defintely was a bad idea to purchase it as a begginer synth though, this one takes a bt of knowledge to be able to get some nice sounds, and the factory presets don’t give the engine justice.
Anyway, thought I’d come back here to thank all of you that gave me advices on how to get interesting stuff out of it, I’ll try those again now 
Try layering sounds of 2 or more tracks to make complex one-shots (you can sample into Syntakt, I hear).
The second filter is very important. Experiment with it, use it, modulate it a little.
Use the distortion but only a little, keep it under +10
Buy a sound pack that fits your tastes and use them as jumping off points.
Actually, I rediscovered the A4 by using Filter 2 only: it’s not because you have 2 filters that you need to use both ^^
It’s essential for a meaty low end 
A friend of mine tried my AH behind is A4 mk1 a few weeks ago, he discovered a whole new world: A4 likes some distortion behind 