Sustain for days?
Try the Fuzz!
When I need the right tone for the ultra-sustained leads, I go for fuzz.
And ideally I use the fuzz into the crunchy tube amp.
In this case I have used the SMR Toys N-1 FUZZ into my vintage Vermona MV3 boosted with ProCoRAT.
Awesome inspiring tone :)
Watch the full song playthrough using the N-1 Fuzz throughout the whole song on my YT channel:
Check out the N1-Fuzz pedal here and don't forget to make your own design with the design configurator!
May the muse be with You!