alm-busy-circuits-stereo-sum

ALM Busy Circuits STEREO SUM

Four stereo pairs into two flexible unity mix outs

4 HP Eurorack module

The STEREO SUM is a passive-style unity gain stereo summing mixer that combines up to four stereo input pairs into two independent stereo mix outputs or a single combined mix. It is DC coupled, making it equally useful for audio mixing and CV summing. Its normalization routing allows flexible signal combining without requiring all outputs to be patched.

Features

  • Four stereo input pairs summed to two independent stereo mix outputs
  • Unity gain summing — no attenuation of inputs
  • DC coupled inputs accept both audio and CV signals
  • Left inputs normalised to Right inputs for easy mono signal use
  • Stereo Mix Output 1 normalised into Mixer 2 section when left unpatched, enabling all four pairs to combine into a single stereo output
  • 4HP compact form factor
  • Compatible with stereo mixer modules such as MEGA-TANG and Jumble Henge

Controls & Jacks (12)

  • Stereo Mix Output 2 Right— Final stereo mix output 2 right channel.
  • Stereo Mix Output 2 Left— Final stereo mix output 2 left channel.
  • Stereo Input Pair 4 Left— Stereo input pair 4 left channel. Accepts audio or CV (DC coupled). Left normalized to right for mono signals.
  • Stereo Input Pair 4 Right— Stereo input pair 4 right channel. Accepts audio or CV (DC coupled).
  • Stereo Mix Output 1 Left— Stereo mix output 1 left channel. Normalized to bottom mixer section if unpatched.
  • Stereo Mix Output 1 Right— Stereo mix output 1 right channel. Normalized to bottom mixer section if unpatched.
  • Stereo Input Pair 1 Left— Stereo input pair 1 left channel. Accepts audio or CV (DC coupled). Left normalized to right for mono signals.
  • Stereo Input Pair 1 Right— Stereo input pair 1 right channel. Accepts audio or CV (DC coupled).
  • Stereo Input Pair 3 Right— Stereo input pair 3 right channel. Accepts audio or CV (DC coupled).
  • Stereo Input Pair 3 Left— Stereo input pair 3 left channel. Accepts audio or CV (DC coupled). Left normalized to right for mono signals.
  • Stereo Input Pair 2 Left— Stereo input pair 2 left channel. Accepts audio or CV (DC coupled). Left normalized to right for mono signals.
  • Stereo Input Pair 2 Right— Stereo input pair 2 right channel. Accepts audio or CV (DC coupled).

How-To Guides

  • Combine Four Stereo Sources to One Output
  • Two Independent Stereo Submixes
  • Mono Sources Into a Stereo Mix
  • CV Summing Bus
  • Combining Multiple MFX Returns
  • MEGA-TANG and Jumble Henge Output Merge
  • Parallel Dry and Wet Blend
  • Layered LFO Modulation Source

Explore the interactive STEREO SUM panel on BleepDex — tap any control to learn what it does.

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