This has been bugging the absolute hell out of me for the past few weeks. I've been playing guitar for 6 years. Yet... I cannot tell whether the ones in grey's remixes are real or fake. Certain things make me think that they're real but then certain things sound fake to me like the fast sixteenth notes at 0:36.

https://www.youtube.com/watch?v=hOMjpqAS0Vk

Are they just processed really hard or something? Even the sound of the pick striking the strings sounds like it's extremely emphasized to the point of being unnatural like at 2:34. The work is INCREDIBLY realistic from an orchestration point of view on nearly all of grey's songs. The fingerings are ones I'm familiar with.

Certain songs sound more "fake" but then this one right here sounds like it's the realest of them all.

https://www.youtube.com/watch?v=73Wo7GBaX_w&ebc=ANyPxKo3VAZa64puAqI3FF_lY-aSxMtZfzEhMVAbfP2mm0XKk86JIiWB1YU17oovU6NVk4Qivc-G2GdO4Oe-pLZNgmRMz8v_wg

Seriously. If this is a sample library then does anyone know which one?

Definitely very real. Just a whole lot of compressing

I was thinking that the compressing would bring out the pick attack of the strumming as well. Still... I'm not too sure about that part at 0:36. It sounds fishy to me. 

Pretty convincing to me! But it's really hard to say, I mean, a sampled guitar is still real. I'm almost certain that there's at least some chopping going on, the starting notes of the main riff sound too similar each time. That fast bit, dunno, I found a reasonable way to play that, so at least there's nothing impossible about it. But then again, I don't think it would be very hard to recreate with a comprehensive sample library.

After learning some of their songs I'm just going to come to the conclusion that they're real because I haven't heard any sample library that is capable of reproducing that acoustic guitar sound. The pick scratches, slides, bar chords, are all just way too realistic and orchestrated in ways that would lead me to believe that singularity has to be a competent acoustic guitar player.

It's clear that IF it's created from samples, the guy has to have a pretty deep understanding on how to play the guitar. And for all we know, he could have made a custom sample library...

Although I'm a guitarist, I would actually be more impressed if it was samples. Either way, sounds awesome.