I was searching for an all in one modeller for guitar and bass since 2021. After 2 years of extensive youtube videos, forum crawling and internet text reviews I settled for the GT1K core. I play guitar and bass and needed an all in one compact solution (for the time being) as I do not own any amps or any pedals. I have been using Helix Native since 1 year, including for rehearsals through audio interface and MIDI foot controller with my band.
First impression: out of the box after adjusting the input level for both of my electric instruments the sounds are very much useable. I did not have to struggle for weeks and weeks on end like I had to do with Helix Native and the sounds are just as good if not better. As this is only after 48 hours I am still choosing my words carefully but initial impressions are very positive. I wont talk about cosmetic appearance and build quality, it is very decent. I do not think it will break soon as Boss products have good reputation.
Now comparing to patches I made from scratch: I had to watch few videos to get used to the layout, how assigns work etc etc. But I had been doing my homework before I received the unit in mail so I knew what to expect. People say "oh it is so intimidating Boss UI is so difficult to navigate" that is NONSENSE because like EVERYTHING in this world, there is a learning curve. Yes it may not be for everybody but show it the love it deserves and you will get the same love back in terms of sonic results. Everything about this exudes quality EXCEPT the micro USB B type USB input jack. I had to by a separate cable for EUR 36 and I am quite mad about it.
I spent hours separately with my electric (Charvel San Dimas style 1 HS HT with Seymour Duncan JB) and Tobias Toby Deluxe IV Jazz bass and have made my tones in less than a day compared to weeks/months with Helix native. I actually purchased the GT1K because after a year of using HX native and being frustrated with it constantly. I even purchased 3rd party IRs, preset packs from famous youtubers and it was just lifeless. This GT1K on the other hand is definitely an upgrade ONLY in terms of saving time. As far as tones are concerned, I am hearing different "modelling flavor" but the fidelity of GT1K core is higher (probably due to 32 bits AD/DA)
Here is something for bass players as I have seen ZERO reviews for this device for bass only:
I got to almost 80% of Justin Chancellor's (Tool) tone in literally a day. What else do I need to say? This is without 3rd party IRs, no purchased preset packs. The bass effects are amazing and the bass amps are very well, round, full bodied and just punchy. The pick attack feels like you are playing through an amp. Of course my comparison is with Helix Native and I have to say I am very happy I got the GT1K core. Bass effects are supreme quality, pitch bend effects have no weird artifacts and bass wah is MORE useful than any wah model in Helix. I have made a pretty complicated chain with only 4 assigns (3 from 3 footswitches and one from expression pedal heel down as tuner, I am using Boss EV-30. Great pedal works immediately after connecting.)
I will update this review after 6 months. For now I can definitely say this thing is amazing. I will now build a small pedalboard around it.
So here are some more finer updates:
1) Guitar: No complaints. I love this. It does everything I want and more. The feel, response to picking and playing dynamics is superior to any modelling technology I have used (including NDSP, STL Tones, Helix Native etc.) As tone is preferential, for my kind of tones it does a great job.
2) Bass: I have been struggling to achieve a tone I am 100% satisfied with. More specifically I have a problem with the X-bass compressor. I am not able to dial it in, but I guess I need to spend more time on learning how to do this. I have made tones from scratch and each iteration introduces a small variable in the way I dial tones, but the end results vary HUGELY. So there are both pros and cons to this, pros being that I SEE that this unit has potential to have a HUGE variation in any tones you want to make, but the con is that with my bass (I think it is the fault of my bass) is shitty and maybe with a better bass it might be a bit different. In a nutshell, my problem is the lower end being "boomy" and "sub-woofer-ey" . There is also a hissing noise in all bass patches I make using the Bass Drv effect, however my bass (Epiphone Tobias Toby Deluxe IV) is notorious for having hissy and cheap electronics, so I am wary to blame the GT1KC for this problem.
The insight from this is (IN MY EXPERIENCE): the quality of your guitar/bass and the electronics play a HUGE role in the output quality. It gives the impression of how clear and transparent the converters are. If you use a good quality guitar bass with good quality components and electronics, you will really hear each detail. I am seeing a huge difference between my guitar and bass, and it has made me realise it is time to upgrade the bass :D
Effects: World class.
Durability: world class, buttons are amazing
Flexibility: Spend some time to learn how the UI works. You can re-route things like crazy. You can also see paths in stock patches to understand this.