With the Serge Resonant EQ (Eurorack version) a simple sequenced waveform can be turned into something quite different by turning a few knobs: first loop is a (single) SAW wave from a PCO - nothing else(!) -  the second part a sine. Some Shimmer added as my son insisted ... (of course the EQ can also be used for very subtle timbre effects, however, this was not the point of this demo)
Eurorack version is now available as a DIY kit on http://randomsource.net/serge_euro

Serge Resonant EQ - raw loops

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Modular Synth DIY kits and supplies.

Serge Resonant EQ - raw loops

Random*Source