Downunderwonder

Safer than motorcycles.

Wanting to be louder and then not be louder still when you slap is not possible without 'compression' of some kind. You could modify your technique to bring up your regular volume and slap more gently. Good luck with that. You could find a compressor that catches transients while not destroying tone. You could find a tube amp with just the right natural compression at the volume you want. Good luck with that.

You want compression that sounds like you want it to sound. You can either disappear down the compression rabbit hole or learn to do it with your fingers. At low volume your slap sounds are less bassy to the ear (Fletcher Munson). The extra HF in the slap is welcomed. Everything is coming out uncompressed. Life is good. The slapped bass overdriving the preamp is your problem? You turn down the input gain and turn up the loud knob. What happens then? Turn down some of the bass EQ!

If I had a dollar for every time an interrupt jack socket was corroded.....

You are probably correct but without the whole story it's impossible to know. Any number of misfortunes could have befallen a family member and not made public. It could be a bigger than usual bump in the road. The 10th anniversary jam was a night not to be missed. Two whole drumsets bass rigs etc etc so no breaks and an unholy all-in jam for the last hour.

I am not familiar with older stuff. Presumably there is an fx loop. On mine it is a parallel loop but I think your is in series.? Quite possible you can insert a patch cable onto it and all will be well. The old insert contacts can get corrosion between them breaking the signal at the loop. If it's a parallel loop you want to turn it all the way off and insert the cable for good measure.

Put the streamliner in a backpack. Then you're not carrying it. Problem solved.

The bank's dirty little secret is they bone the merchants via merchant banking same as the credit cards and they CAN do a charge back.

Still this... Going strong.

If you mean the powered one10, dual duty bass / PA cab, it got mentioned with the BF demo youtube. Blimmin' expensive, sunk without trace?

There is BAX thread, hopefully you paid by credit card, do a charge back before everyone else does.

Not to be confused as GAK!!!

Aka EQ unit?

How do you get output without gain? Must be a definition problem.