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[li]Set OSC 1 to “Filter Feedback” and play around with cutoff and resonance on filter 1 for some extreme feedback effects.[/li]
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Yeah, filter feedback on Osc1 is the key to unlocking the A4’s aggression. I agree that it does sound quite ‘polite’ by default but set up feedback and start exploring F1 resonance and drive and it can get very rough and textural. Note that overdrive often mitigates the filter resonance - a little of the distortion can go a long way, sometimes too much just leads to a loss of definition. Don’t forget to set the extended F1 resonance in the sound setup page. Also, consider using polyphony and unison for when you really need to bring the pain.
Also explore the envelopes and especially the envelope shapes. I find that envelopes and LFOs on Elektron gear often seem to be calibrated a bit differently from other synths, and don’t always yield the expected result, eg LFO depth often seems to go to 200% or more.
Finally the effects on the A4 can be overdriven from the amp screen. Turning the reverb send all the way up can lead to delicious howls and shrieks depending on the input material. I get great results with a HP filter and a lot of resonance on F2, for example.
I like dirt - it was a big factor in my purchase of the A4. Part of the charm of analog is the availability of nonlinearity and chaotic behavior.