My second time with the WMD - Aperture brought me to a completely different and really beautiful place. 

Much More than a Filter 

The Vermona DRM-1 MKIII and my two A-143-9 modules - my long-time drum machine and tone sources were used to see what the Aperture could do with them: the results were fun and of course they I had endless colors of brutality too. But that was just the beginning of the story.

The two filters are resonant and very sensitive - I could talk about their sensitivity and their endless convolutions against different input signals (let it be the drum patterns from the DRM-1 or some  good ol' sines from 2x Doepfer A-143-9 modules). Once I left a little noise on one of the channels from the SSF Quantum Rainbow and I was astonished by the textures created by the resonance and feedback. The constant ring of the Aperture might be off-putting for some people though - but it can be controlled even in the module as all parameters have CV ins. I was using my favourite slope generator (DUSG by Random Source/Serge) and my all-time envelope follower (A-119 from Doepfer) to control it.

VCOF

The thing I realised time after time is that calling the module "a VCF" could not be more misleading - the Aperture is a generator first - its sines and distorted rectangles warble and chirp in such a great range: from FM techno bleeps and whoops to percussive magic (changing each time with different inputs). Another thing is that none of the knobs work in such a way you expect it from a standard VCF: even a millimeter up or down you end up in a new kind of joy. I could compare it to the Fold Processor by Tiptop Audio. I could say that if you liked the self-oscillation of the Xaoc - Belgrad or the resonance squealch of the Rossum - Evolution, this thing will blow your mind. 

The module knows the moderately aggressive, "lo-fi" "chiptune" style squeaks and tones that you loved in WMD's Geiger Counter or some settings on their Synchrodyne as well. This characteristic dirt is more present in the second feedback mode, available with a flick of a switch. 

All in all,  with its extreme range (goes up to 50kHz!) and warbling bleeping polytones the WMD - Aperture is more like a generator or drum spice, not the VCF you show at a beginners modular workshop. But it is totally unique and fun for what it really is! 

Check out the audio demos on Analogue Zone's Soundcloud!