My Yamaha electronic bass pedel is not working. If I unplug the connection to the computer and plug it back in I will hear only 1 sound of the base drum. Could the base pedel round pad which is hit by the beater be defective?

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Your amp has two inputs - Passive and Active. Do you get the same results plugging into either one? If only one works, then the other needs reconnection or replacement.

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.

If you have already tried a different cable and it didn't work, then the issue might be with the bass drum pad itself. You can try the following steps to troubleshoot:

1. Check the connection: Make sure that the cable is firmly plugged into both the bass drum pad and the module. If the connection is loose, the signal may not be transmitted properly.
2. Check the sensitivity setting: Check the sensitivity settings on the module for the bass drum pad. It is possible that the sensitivity is set too low, and the pad is not registering hits.
3. Check the pad: Check the bass drum pad for any visible damage or wear. It is possible that the trigger inside the pad is damaged or malfunctioning.
4. Reset the module: Try resetting the module to its default settings. Sometimes, this can fix issues with individual pads.

If none of these steps work, it may be necessary to open up the pad and check the trigger mechanism inside. If you are not comfortable doing this yourself, you can take it to a repair technician.

Check your cables are fully plugged in.

There is a problem with the electronics between the audio supplied to the headphones and the speakers. Unfortunately, there is quite a bit of circuitry between those. When you plug in the headphones, a switch opens that sends a signal back and forth to the DM board which changes and electrical relay that disconnecs the speakers. There could be any of several failure points on this circuit OR a failure of the power amp or audio to the power amplifier chip that drives the speaker. This is NOT a DIY repair unless one is adept at electronic troubleshooting.

Common problem would be a broken wire while working on it. Another less visible problem is when a pot or connector gets a terminal rotated a bit and touches the conductive PAINT in the cavity with the electronics.

it could have blown the speaker, a regular guitar amp is not meant to handle a bass, you should be able to look into the back of the amp and see if any of the speaker is damaged, or there may be a blown fuse inside the amp, if you check for this please MAKE SURE TO UNPLUG THE AMP FROM THE POWER SOURCE FIRST, and if needed replace the fuse with the exact same type

well i am not sure what r u talking about,but as i met the same problem,i assume that you mean you lack one cable...What you should do is:
1.Connect the cable to the cymbal.Then connect it the ending of the cable with bass drum(not with the device)
2.Connect the bass drum with the device,as there will be 2 cables in the bass drum.Then plug it into the device & you will be ok.

this is an easy problem to fix. The piezo piece on the inside of your bass drum trigger uses a double sided tape that is fixed to a metal disc. the piezo trigger just fell off. mine did the same thing. I actually glued mine with epoxy and have not looked back.