New bass that has no sound when plugged in to amp.

Have you checked the battery? Put a brand new one, if that's not the problem, take it to a reputable tech.

As a 40 year guitarist and repair technician I had to laugh at this until I thought about my younger days of starting out. What I see here is that you made a momentary trigger out of a stomp box that apparently had problems, that you think you can build an electronic bass drum to play it with. Is this correct? See, the amp only gives a bass drum sound ONLY if a bass drum sound goes through it. Amps only provide audio power to the input signal. Where to get you bass drum sound is what you need to find. I believe you are thinking of a sample. A sample is an actual recorded sound of a bass drum that you could actually trigger by stepping on that button. You could find this on most cheaper casio, yamaha, emerson, radioshack, keyboards or drumpads or any of those amateur toys. Most of them allow a trigger pedal to be plugged into it and operational. Now, after you find something with a bass drum sample that you can trigger with your pedal, that device should allow you to plug it into an amp to amplify it. I hope I didn't confuse you much and had a close perspective of what you tried to describe. Please let me know if I can help further.

Very unlikely, sounds like it's faulty. Was this on plugging in or were you using the amp, and if so doing what? What is your supply oltage?

I would say, that it probably needs a new 9V battery. It had some time to gain some juice after the gig. If a fresh one doesn't help, then the problem could've been the equipment or power outlet distribution at the gig site.

That bass combines passive EMG pickups with an active preamp (which provides the bass and treble controls). Sounds like you are never getting the preamp to work, and if that is the case there could be numerous reasons...a dead battery...jack wiring that is broken (meaning the battery ground wire is not attached or is grounding out)...likely should see a tech, but that is a good sounding bass when working correctly.

Protective circuits kicking in. You may be overdriving the preamp to a clipping condition the amp sees as a problem. If it is under warranty, contact Line 6 and see if this is normal for this amp. It should not be, but you never can be sure.

does your bass have active pick ups?
do the ratings on your amp match the ratings on your speaker?
are you using a pedal?
does your pedal have an output adjustment?
have the ground on your bass checked.
make sure you're using the right kind of cable.
and be sure that the outlet you're using is grounded.

The wiring in the back is so very thin and the circuit board isn't attached to anything but the wires that are attached to it. I found two weak solder joints there and one in the battery compartment (you'll have to remove it to get to the solder joints). I don't know which repair did the job, but it's working for now, anyway. I'd like to replace the tiny wires but there's not enough room in that compartment. I, also, had to replace the 4 bridge screws with larger diameter SS screws months ago as ALL 4 were stripped. Thread too fine for wood that soft. Come on Dean, step it up a notch! The bass plays and sounds great.

There is an inconsistency in your text. You indicate that cables were swapped and problem still existed...
You said:... "i have tried using it on a different amp and still fine".

If you tried it on a different amp and it was still fine then the guitar is probably OK.

THEN your amplifier is in question as the root of your problem.

What is the amp you have? The guitar is the CB-42, but what amp do you have?

MANY intermittent problems with amplifiers are often with the input jack itself. These jacks are easily broken by tripping over a cable plugged into them.

Assuming that the amplifier is functioning properly, I suspect that the problem is either in the cord, the plug socket on the bass, or the volume control potentiometer. First, I would try another cord that is known to be in good condition (ALWAYS plug the cord into the instrument FIRST). Second, carefully remove the cord receptacle plug from the bass and examine the solder joints (check for loose wires). Third, carefully remove the plate that holds the volume and tone pots. Examine these controls for loose wires or faulty solder joints. CAUTION: If solder joints are found to be the culprit, care must be taken to correct this problem. If too much heat enters the pot, it can be ruined!