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The hum is likely to be the sound of the ac mains electricity, either because the power supply smoothing has become ineffective in the amplifier or one or more of the audio peripherals or because the audio connections to the input of the amplifier have created a hum loop that is picking up the radiated energy from the mains supply and feeding it into the audio input.
Multiple grounding is often the reason for a hum loop. This is where an audio peripheral is not only grounded through the supply cable but is also grounded through the screened audio lead.
If the hum persists when there is no inputs connected the problem is almost certainly power supply related, otherwise it is likely to be a peripheral that has a faulty power supply or the culprit is a hum loop.
Hi-fi officianados have a number of tricks to deal with hum loops and google could lead you to these.
Grounding is an important safety consideration so appliances that are intended to be grounded must continue to be grounded but the loop could be broken by using special audio leads. The usual lead would use the screening as a conductor and so the screen must be connected both to the peripheral and to the amplifier.
A better lead uses an extra core conductor and the screen then becomes just a screen and is grounded only at the amplifier end and is not connected to the peripheral.
The display is usually held against the circuit board with 2 or more strips of multiconductor rubber. it may just need the clamping tabs tweeked to make a more secure contact. If the drum set fell, it could have shifted the circuit board in relation to the display. Parience and careful observation will allow you open it up and make that tweek.
Mine and a whole lot of others did the same thing with the SD9K Simmons kit. I called Simmons, they sent me a new power cord...that obviously didn't work. Then they said to wait on a new drum module...that never came. It's been 2 years and now they say they have no records of ever talking to me or sending me the power cord!!! Horrible product, horrible customer service. Whatever you do...don't put any more money into Simmons...only go with Roland!! Trust me on this one!! Me and about 3 others I know waisted $900 on Simmons and we are all paying the price now. So, to answer your question, you need to buy a $300-$400 new module!! Ridiculous!
If you look on the circuit board that the big black heat sink is attached to, there are two output amp chips (integrated circuits) attached to it. IC7 is the sub output amp. Next to that is a white jack with two pins sticking out, labeled J9. J9 is where you plug your sub into.
Press the "click" button and then set the tempo you want, press the "click" button again this will stop the metronimoe but is also sets the tempo in memory. The next time you press the "click" button it will be ready to go.
Anytime you press the tempo + or - it thinks you are trying to use the "Tap Tempo Function".
With the sensitivity set very high, you might be getting false triggers from static discharges. It sounds like your snare trigger is either bad or possibly the cable from it may have a problem as you should NOT have to set the sensitivity so high.
It will take an oscilloscope to test the pad unless you can find a system to do a sensitivity comparision. The second problem regarding the recording/overdubs I cannot help you solve.
I assume you have this connected to a professional type PA system (you would damage a consumer stereo system) You should be able to use headphones from a headphone jack... do your testing with that. There are many tweeks of the electronic box and you USUALLY have to CALIBRATE the box for each of the triggers. Sorry, but one does have to spend a bunch of time reading the manual on setup and reading is not as fun as playing... Get familiar with the menus in the box as that is where it all happens...