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When you're mixing multiple tracks, everything will eventually be mixed down into a two-channel stereo main mix that it can be exported. That process of combining multiple tracks into a main mix is called summing.
A summing amplifier simply sums multiple audio streams to stereo, while the DAY's mixer is used to perform the mixing functions of balancing and panning. To put it simply, if it has level controls and/or pan pots on the inputs it is a line mixer, not a summing mixer.
A summing mixer is analog hardware for turning multi tracks into stereo. Basically, a mixing desk but, designed specifically for this task. The inputs will be line level instead of mic/instrument. Digital summing (Protocols bounce or w/e) is a verbatim.
The cost is worth it IMO if you have good converters and outboard processing in place already. 'Hope this helps, If you use good converters, then a summing mixer won't “add” anything per se (unless it's an intentionally colored model), it will simply lose less than ITB summing IME.
A summing mixer is still a mixer, but it strips away all the bells and whistles. Mine has volume/ gain for each channel along with panning. It weighs a lot less than a console, is much easier to maintain + repair and most importantly: gives your audio some hardware vibe.
Summing is simply the process of combining all of a session's tracks and outputting them to a single stereo source. Before digital, summing was done inside a console. And when digital recording was developed, many people complained of its inferior summing quality.
Summing is simply the process of combining all of a session's tracks and outputting them to a single stereo source. Before digital, summing was done inside a console. And when digital recording was developed, many people complained of its inferior summing quality.
When it comes to combining audio in a multi track recording, there are two categories of methods: digital summing and analog summing. Digital summing is accomplished within the software of a Digital Audio Workstation (DAY). Analog summing is accomplished using external hardware to the DAY.

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