Monday 28 June 2010

Patch Tips #11 - AC-coupled Mixing

Abusing the Fonitronik Attenuverting Mixer as a fixed-rate slew limiter.



Mixing CVs can yield complex modulations. Fonitronik's mh-01 is perfect for the task and also has a hidden trick up its sleeve. Flicking the mode from DC to AC sends the sum through a capacitor, which leads to a pleasant and unpredictable rounding of the signal.


Two mixed LFOs. Change from DC to AC mode @ 8 seconds.

This is great for cyclical modulations and, while it's less useful for pitch information, can also be used to avoid clicks when feeding a VCA with a S&H signal.

5 comments:

fonitronik said...

Great idea. I would have thought the cap was too slow. But hey, it's great what you're doing here...

Navs said...

Thanks, Matthias. The credit for the tip goes to Paul @ Schneiders.

Chuck said...

How is this mixer for audio? I'm looking for a mixer but don't want to go the a-138 route.

Navs said...

I think it is cleaner than the Doepfer and doesn't filter the highs. Like all mixers, though, there is only so much headroom i.e. if you feed it 4 VCOs at max, it will overload.

Chuck said...

Thanks for the info, Navs!