Kanali 1-2 nude kombo XLR-1/4"-ne Mic/Line konektore i Hi-Z prekidač (za gitaru i bas), dok kanali 3-4 nude XLR ili 1/4"-ne ulaze. Kanali od 1-4 uključuju inserte, i kompresiju "na jedan" potenciometar. Kanali 5/6, 7/8, 9/10 nude po dva 1/4"-na ulaza, dok kanali 11/12 koriste 3.5mm-ski stereo ulaz. Kanali od 1 do 10 poseduju Gain kontrole, trofazne ekvilajzere, Aux (monitor) signal (send), pan, mjut i fejdere nivoa. Angažman USB 3-4 prekidača kanala 11/12 će nadići 3.5mm-ski input i omogućiti povratni signal (return) iz kompjutera. 

Regler svakog kanala uključuje i dugmiće za selektovanje Main L/R, Sub 1/2 i Solo (PFL). Master sekcija nudi fejdere za Main, Sub, i efekte. Main izlazni konektori uključuju i XLR i 1/4"-ne, dok sub i control room izlazi koriste 1/4"-ni konektor. Namenjeni 1/4"-ni TRS izlaz za slušalice ima svoju, nezavisnu kontrolu nivoa. Druge funkcije uključuju ulaz / USB 1-2 blend kontrolu, namenjeni autput efekata, fejder nivoa efekata i FX Mute (koji se može kontrolisati i 1/4"-nim ulazom za pedalu).

ProFX12v3 dolazi sa ProTools I softverom za preuzimanje, kao i paketom plag-inova The Musician's Collection sa 23 HQ plag-ina (uključujući BBD Delay, Level Lite, 304E EQ, i 304C kompresor). Takođe dobijate i Tracktion-ov Waveform OEM & DAW Essentials kolekciju. Za autorizaciju softvera, jednostavno unesite serijski broj na sajt. ProFX12v3 uključuje i USB kabl i napajanje.

Features
Professional Sound Quality
Equipped with 7 Onyx Mic Pres offering up to 60 dB of gain and ultralow noise performance
GigFX Effects Engine with 24 different FX options, from reverbs to delays and more
Essential Mixing Tools
3-band EQ on all channels
Channels 5 to 10 feature mic inputs and stereo line inputs for maximum versatility
Hi-Z switches allows direct connection of guitars, basses, and other instruments
100 Hz low-cut filter and 48V phantom power on all mic channels
Stereo 3.5mm input on channel 11/12
Aux/Monitor output with dedicated per-channel send control
Stereo Subgroup output bus with per-channel assignment
Headphone output with separate level and blend control
Insert jack on channels 1–4
Pre-Fader solo on all channels
Footswitch input for FX Mute
Single-knob compression helps keep your input levels in check
24-Bit / 192 kHz 2x4 USB Recording Interface
2x4 USB I/O allows you to create two custom mixes on your computer to send back in to the mixer
Perfect for live performance recording, music playback, live streaming, and more
Latency-Free Monitoring
Easily blend between monitoring your computer’s output and a direct feed from the mixer
Professional Production Content
Pro Tools | First and Waveform OEM professional software and plugin packages included
The DAW Essentials Bundle for Waveform OEM includes 16 powerful plugins like Equalizer, Compressor, Reverber8, and Limiter
Signature Rugged Design
Mackie built-like-a-tank design
Solid steel chassis protects your investment
Tough ABS side protection

Included Software from Avid, including Pro Tools | First
An industry standard for decades, Pro Tools | First is easy enough for beginners yet sophisticated enough for experienced musicians. Get many of the same tools used by your favorite artists and recording studios. And now you can collaborate online with anyone, anywhere, and create at the speed of your imagination. Available for macOS and Windows operating systems.
You also get Tracktion's Waveform OEM and the DAW Essentials Collection.
In addition to the powerful plug-ins within Pro Tools | First, this mixer comes with the exclusive Mackie Musician Collection featuring 23 fantastic plug-ins, including:
Avid 304E EQ: Add musical warmth with a treble and bass equalizer with sweepable mid control
Avid 304C Compressor: Tweak the clarity, balance, and rhythmic feel of music with this optical-modeled compressor
BBD Delay: Create delay, chorus, and vibrato effects based on a classic guitar pedal
Black Op Distortion: Add rich distortion based on a classic distortion pedal
Black Shiny Wah: Achieve the famous classic tones of a respected wah wah pedal
Black Spring Reverb: Get the twang and space of a vintage amplifier
C1 Chorus: Emulates a classic chorus pedal
DC Distortion: Dial up a range of overdriven tones with this Avid custom distortion effect
Eleven Lite: Get the sound of popular guitar amps and speaker cabinets
Flanger: Create esoteric sounds with this homage to vintage and modern flangers
Graphic EQ: Sculpt frequencies with ease
Gray Compressor: Add warmth to tracks based on a vintage Ross compressor
Green JRC Overdrive: Get the coveted sounds of a classic IC overdrive pedal
In-Tune: Keep your instruments in tune with this digital tuner
Orange Phaser: Create interesting effects with this phase shifter based on a classic design
Roto Speaker: Recreate the sounds of a Leslie rotary speaker cabinet
Sci-Fi: Add analog synth-type ring and frequency modulation
Studio Reverb: Create natural-sounding reverb and ambient effects
Tape Echo: Add vintage analog delay and chorus effects
Tri Knob Fuzz: Get the Hendrix tone with this fuzz box based on one of the first fuzz pedals
Vari-Fi: Create the effect of audio changing tape speed
Vibe Phaser: Add phase-shift and rotary speaker effects
White Boost: Boost gain without coloring tone