You'll need to give us some more details - which "strings" waveform are you using? There's about fourty-leven of them on an MOXF - everything from orchestral to Oberheim.

If it's sounding "muffled", that's probably not resonance. You've probably got the cutoff set too low - turn that up to allow more treble through.

Can you point at a specific time in that video? I'm not hearing a lot of "pad" in there - a few places where there's an arpeggiated keyboard part for a few measures. Most of the song, if there's any pad in there, I'm not hearing it through the guitar/bass in the mix. What do *I* hear in there? (OK, so I'm primarily a guitarist, so unless it's a sound that I know can't be easily done on guitar, I'll blame the guitar 😉

3 guitars, two electric, other a piezo-miked acoustic. The acoustic is providing the obvious parts like the intro.

At 0:32, we hear a chord - that's the bass holding the bottom end, and electric guitar hitting a power chord (probably drop-D tuning), a bit of gain on the pre-amp to add crunch and overdrive, then fed through a compressor to give it sustain. At 1:01 to 1:03, the guitarist slowly opens up the gain a bit to make it ring out more.

0:38-0:58 or so there's a keyboard playing a repeated 4 note pattern, picked up by the lead guitar after the drop at 1:06 and repeated for most of the song.

During the end, around 4:30 in, there's a low drone sound, but a big chunk of that is a guitar just hitting a slack-tuned open string power chord and letting it ring out, with the volume/gain set *just* under feedback levels, so there's the Sustain From Hell. All the same, you can hear an open D string getting hit 3-4 times around 4:33 to 4:37 because the sustain is cutting out and the guitarist needs to give it a kick.

There's also a bit of a keyboard drone finally audible there - a quick check tells me that 'Pre6 A12' "Warm Backing Pad" is fairly close. Play with the cutoff up/down and see what your ears tell you.

Hope that helps..