#studio wiring

I can’t believe that I haven’t written about using #PatchBays in the recording studio before! So let’s remedy that omission straight away with some essential points about how to use them.

At first, knowing how to use a patchbay seems like it would require a textbook, a doctorate in electrical engineering, an IQ of 300, and some magical incantations.

But really, once you know the fundamental rules and conventions the process is as easy as running cables from one piece of gear to the next; and that's all a patchbay does.

Rule 1 - the top jacks are for Outputs

Always envision the audio signal going into the top back jack and coming out of the top front jack. The top jacks are called output jacks because the top back jack receives the output from whatever piece of gear you're using and spits it out of the front top jack.  If you follow this rule (as do all professionals) you will only be dealing with the outputted signal when you're patching the top row.  In most cases (keep it simple for now), the signal comes out of the keyboard or microphone, goes into the top back, and comes out of the top front. The outputs are top only, back-to-front.

Rule 2 - bottom jacks are for Inputs

So now you have your signal coming out of the top row on the front of your panel.  You plug in a patch cable and route it to the bottom row, which is the exact opposite of the top row.  It is only for inputs on your gear.  The signal flows into the cable, into a bottom front jack, and out of the bottom back jack and into an input in another piece of gear. The inputs are bottom only, front-to-back.

Rule 3 - Connections only occur top-to-bottom

Since outputs are on top and inputs are on bottom, you will never need to or want to patch a cable from a top jack to another top jack.  The same goes for bottom to bottom connections.  They don't happen. Patch cables only ever connect a top jack to a bottom jack.

Normal, Half-Normal, & Thru Modes

There are three ways the jacks are wired together that represent the three main modes of usage. These are known as #PatchbayModes. Some patch bays let you change modes with a switch. Some require you to physically manipulate the jacks. Some don't let you change the mode.

It's fine, though. You can stick with Normal mode and be perfectly happy, you'll just need more patch cables. But if you learn to use the other two modes you can really dial in the magic to save you effort and cabling time. Let's discuss each mode:

Normal Mode:  The top output jack sends the audio signal to the bottom input jack until a patch cable is inserted. The cable interrupts that signal path and intercepts it, sending it through the cable only.

Half-Normal Mode: The top output jack sends the audio signal to the bottom jack even if you've inserted a patch cable. This lets you split the signal to send to two inputs.

Thru Mode: The top output jacks only sends the signal to each other, back-to-front.  Unless you plug in a cable to send the signal to an input, the signal hits a dead-end.

For the most part, Normal Mode and Half-Normal mode will take care of all of your needs. Most of us hang out in Normal Mode, where we record and do simple mixing and clean-up equalization work out of the box and then send the signal to the interface, where we finish up the mixing in the box (meaning in a software DAW like Pro Tools or Logic Pro).

Aux Insert / Send

Two TRS insert jacks on your mixer will only get you two outs. If you are using it as a direct out with just a TS cable (instead of the standard insert y cable) you are only using the send (from the mixer) and the other half, the return, is unused. An insert is a loop out from a channel or bus and back in.

Connecting to mixer Insert send points