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The filters can be heard in the following order:
0:00 - 0:21 = A-124 (Wasp filter)
0:21 - 0:45 = SY02 (MS-20 filter)
0:45 - 1:12 = Boogie Filter in 24dB mode
1:12 - 1:42 = Boogie FIlter in 6dB mode
1:42 - 2:15 = A-106-6 in 4L mode (XPander Filter)
2:15 - 2:44 = A-103 (303 style filter)
Note that I didn't try to aim for any cool sounds with this experiment, but tried to draw out the different characters of the filters. I also mixed the bass very loud so you'd hear their character and still hear the timing of the sounds (hence the drums in the background).
What's surprising is that there's still quite a lot of that digital preciseness in these sounds. This was mentioned by several people who heard the results of this test. Yes, the analogue filter gives a very different flavor to the sound, but there's still some of that liveliness missing from these examples. This probably means that a lot of the analogue character many people love comes from the unstable oscillators. This is actually quite logical when you think of it. The filter does just what it says on the lid: filters out different frequencies. Sure it also adds distortion etc. but it doesn't modify the harmonic content the same way as for example pulse width modulation or unstable oscillator cycle time does, which is the oscillators territory.
It would be interesting to try this experiment the other way around; analogue oscillators filtered using digital filters. How analogue/lively would the sound be then?
But anyway, it's an interesting technique and I might start using it in some of my tracks in the future.
One final thing:
Naturally this technique works with any software and hardware VA-synth/sampler/ROMpler/FM-synth/etc. you can lay your hands on. Just take your favorite sampler/FM-synth and use it as the "oscillator" for your modular synth.
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