Well the same applies. Look at the coupling capacitors and see if they are above 100nF. If they are not you could increase the value to 220nF but that is what I call Bass Guitar Ready. I suggest if that does not help then start with the amp and work your way back. Again an EQ as outlined and explained in the above video can do wonders for your entire rig. I use a Whirlwind 10 Band EQ in my Marshall Jubilee Effects Loop and it is amazing and simply makes everything sound the way I want it to. All of that with no noise. I will never look back. All of my guitars and pedals now work the way I want them too.