That neato little SFX was a square wave and patching the EG into the VCO's Pitch-In with a high Frequency setting.
It's very easy to pick up and start making all kinds of quirky noises and stuff, so the DS-10 a great sketch canvas to quickly come up with various ideas when a creative urge hits.
The sequencing feels pretty limited, which means coming up with STRUCTURED SONGS takes a lot of planning and setup to implement though. Or maybe that's just my lack of skills, because I've never tried to write music before. Not quite an "all in one" package, but the sound generation is fast, easy, and very satisfying.
So satisfying that it's easy to "get lost" for an hour or more at at time tweaking knobs and going along where the journey takes you. I've had a few sessions where I had to quickly find the AC plugin because I totally drained the sucker in one sitting.
I find it quite easy to make rhythm tracks, so I'm not sure if that's due to my strengths or the DS-10 strengths, but it's harder to come up with good melodies so making vgm-goodness will still be challenging. I'm surprised there hasn't been more hip-hop or rap communities rallying for this thing because the easy beat making would suit them well.