Hey,
I have a Laney GH50L and a crappy Marshall VS412 4x12 cab that I think may be giving me the
sustain problems. Im not entirely sure because it could also be a fault with my GH50L (although I doubt it lol). I use a JS1000 which usually has awesome sustain but with my current setup its just not happening. The only pedal I use/can afford is a DS1 which is just to take the Laneys distortion to 11 on the dial

Without it, the sustain is barely effected, worse if anything.
Can anyone help me pinpoint the problem please?

Thanks!