What is summing mixing?

Summing mixing is a technique used in audio engineering to combine multiple audio signals into a single stereo mix. This process is typically done in mixing consoles or digital audio workstations (DAWs).

The primary purpose of summing mixing is to achieve a more balanced and polished final mix. It allows the audio engineer to control the volume, panning, and EQ of each individual track before combining them into a single stereo output.

When summing mixing, each track is assigned to a specific channel or bus in the mixing console or DAW. These individual tracks often consist of recorded instruments or vocals. Each channel has its own volume control, pan control, and EQ settings that can be adjusted to achieve the desired sound.

Once the tracks have been individually mixed, they are summed together by combining their audio signals. This can be done digitally using software or through analog summing circuits in mixing consoles. The summed signal is then sent to the stereo output, where it can be further processed or recorded.

Summing mixing offers several advantages over mixing entirely within-the-box (ITB). ITB mixing involves solely using software plugins and virtual analog emulations to achieve a final mix. While ITB mixing can produce high-quality results, some audio engineers argue that summing mixing through analog circuits can add warmth, depth, and a more musical character to the mix.

However, it's important to note that summing mixing can also be achieved in-the-box using software and virtual summing tools. These plugins emulate the sound and characteristics of analog summing circuits, providing a similar audio experience.

In summary, summing mixing is a technique used in audio engineering to combine multiple audio signals into a single stereo mix. It allows for greater control over the individual tracks and can add warmth and character to the final mix.