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Very common situation, the main boards are all put together by robots and the small components are available to the manufacturers but not for general resale. Try an electronics store, im sure they would have what you are looking for. It may pay to take the board in. Some boards have the size / spec of the onboard parts written on the board.
If the knob itself comes off the shaft, you need to secure it to the shaft... maybe a setscrew needs to be tightened. Not sure what type knob you have... some of them have a screw under a cover on the top of the knob that pulls up a chuck to hold onto the shaft.
First thing is to check the power supplies. You really need to get a manual that inclides the schematics. I suspect that one of the voltages is not present. Also look for cables that may have partially fallen off.
It is not clear if the volume knob you are talking about is in the amp or the guitar... SINCE you said you verified the amp is OK I have to assume the volume control you are talking about is in the guitar and my answer is based on that...
I SUSPECT that the resistance element and/or the wiper in the volume pot is damaged. One other possibility is the soldering of a wire to the volume pot may be bad. If you are competent with a soldering iron you could replace the pot yourself or take it to a competent guitar shop for repair. I would myself suggest you open the electronics and look for anything obviously wrong. I have ALSO seen one other problem where one lead of a pot is touching the CONDUCTIVE paint in the cavity where the controls are. If the shaft nut becomes loose and the pot slightly rotates this can happen, grounding out the signal.
Easiest is to use a 1/8 inch stereo to 1/4 inch splitter cable (1/4 mono's) and plug into the tape input. Then use the tape level knob.
IF you want to use sliders, then plug the spliter 1/4 inch plugs into two channels and set the PAN controls for these to opposite ends and then you have to adjust two sliders to control the gain.
This is in general for Behringer mixers since you did NOT tell us a model number...
To use the effects you adjust the FX knob for EACH channel for the amount of the mic or input you want to send to effects from that channel. This is the "send" mix.
You dial in one of the effects based on the list near the effects selection window with the selector knob and the number will change and start flashing. You press down on the selection knob which will enter the new effects number and the number will be solid and not flashing.
Then there is a knob to select how much of the OUTPUT of the effects you want to go to the main and sometimes one for the amount to the monitors.
That is all there is to it. The effects can be gated by a foot switch input if you desire.
It is a good idea to include a model number as your thing is posted as if it is a PMP3000 mixer.
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