A high-quality, compact but deceptively versatile summing mixer

You might be mistaken for thinking SUM SUM is an Asian-fusion vegan street-food stall. And, let’s face it, here in Berlin it probably is. Nevertheless, it’s also something even more enticing, and (in a modular system, at least), far more useful.

Not a dumpling vendor

SUM SUM offers two summing configurations: two sets of 6-into-1 mono signal paths, or a single 6-into-1 stereo path.

These signals can be either audio or CV, and the internal gain of each row can be switched between Unity, a gain of 0.5 (-6dB), or 0.33 (-9.5dB) gain… all set using DIP switches on the back of the module.

3U Eurorack module, 6 HP wide, compatible with Skiff cases

Current draw:

• +12V: approx. 20mA
• -12V: approx. 20mA
• 0 mA 5V

Installation depth:

• 30 mm deep
  
  

  Unsolicited advice

  We don’t need to tell you how SUM SUM might be used, but since you’re here, we’ll make some suggestions.

  From a CV point of view, it can combine multiple modulation sources − for example, an LFO, an ADSR envelope, a key follower, and an envelope follower, all working together to control a filter’s cutoff.

  And from an audio perspective, it offers a highly space-efficient way to stack up multiple oscillators for unison patches, without compromising signal quality.