Zoom G2X Four Guitar Multi-Effects Processor with Expression Pedal, Multi-Layered IR’s, Amp Modeling, 75+ Built-in Effects, Looper, Rhythm Section, Tuner, Audio Interface, Lightweight

Has two output modes: guitar amp and line-out. My ears tell me that guitar amp mode is basically line-out mode with treble frequencies reduced so that it doesn't sound harsh via amp (because typical guitar amp raises the treble frequencies centered around 3200-4000 Hz). I am mostly using this to go live to the PA system; but I have also played around sending the signal to the amps available in the jam room.The unit sounds awesomely close to high quality recordings that we hear. Most of the amp models are great and sound very close to originals (e.g. Marshall JCM 800, Marshall Plexi, Mesa Rectifier), the amp model come with their own cabinet impulse response, so you cannot change it. But quite frankly since the unit sounds so close to the professionally recorded amps, I don't see any reason to get into the complication of loading external IRs and then playing around with which sounds best with which amp. If you plug into your amp, do remember to chose the "guitar amp" option otherwise you will end up with harsh trebly tone. While high gain sounds are great, so are the low gain and medium gain tones - this is an area where most modelers fail. AND you can roll of your guitar volume to get a cleaner tone without sacrificing the tone! This functionality is exactly like analog gear (dare I say better than most diode and transistor/FET based pedals).The effects are also great, pedal functions just the way you would expect it to. One "con" I could say is that pedal functionality is "limited" to only volume, wah (3 different types), pitch shift, rotary speakers. Perhaps there could've been expression pedal for phaser, chorus, flanger etc. (Edit, this has been take care in the recent update, there is expression pedal for modulating these effects).Another great point in Zoom is that you can arrange any effect, amp, pedal, anything in any order that you desire (many other processors have a fixed sequence that you must follow).The inputs are 1/4" socket for guitar-in and 1/8" socket for stereo line-in for play along! That is a blessing since who uses phone/laptop/handheld device with 1/4" cable? A very well thought of functionality by Zoom.Similarly, output is 1/4" left and right, as well as 1/8" headphone! Another mark of thoughtfulness by Zoom, since who uses 1/4" jack for earphones?Can be powered via 9V adapter (supplied in the box), or with any USB C-type connecter (blessing, you can carry a battery bank and connect it!). In my opinion this is as good as AA battery support (which this Zoom unit does not provide) perhaps better since USB-C type battery bank could be 10-20,000 mAh - show me a Zinc chloride or Alkaline battery with that much backup!Four foot-switches + Four direction switches (which can be operated by foot but with some inconvenience) = great flexibility in live mode.Many people say black and white screen is not as good as colored screen, and doesn't have touchscreen. I say, it may not matter to most guitarists playing, as long as you can read the display easily while playing live. Zoom hasn't released any desktop app for this, so it could be an inconvenience to program the unit by using the switches and knobs. I have yet to try out the android app.The closest competitor to this pedal would be Valeton GP100, Nux MG300, Mooer GE150, Harley Benton DNAfx GiT, Nux MG400, Boss GT1. Nux MG400 and Zoom G2x Four are the best sounding of the lot.Please spend some time listening to sound samples on Youtube, and decide for yourself.EDIT: OK, I guess the Zoom folks read this review :-) The new update adds a few more effects and the best part is that they can be assigned to the pedal (yes, stuff like pedal modulated chorus effect).