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do i have to change something in the analogue or stereo board if my pads are mono instead of stereo?

You don't need to change anything on the board.

That means that I just connect the tip of the jack to the pads connector?

Yes. One contact to tip, and the other to ground. Use a stereo cable.

Why do i have to use a stereo cable if the pad will be mono?

You can use a stereo cable if you use one input per jack.

So let me see if I'm right:
Mono jacks at pads, stereo cable and stereo inputs that get connected to the 2x20 pad connector on the annalogue board.

Sorry, but I now think that I don't understand what you are trying to connect to what and what problem you see while doing it.

The pads that i will be drumming onto have only one piezo in them so the output of the pads will be mono, right?
I saw that all the inputs on the Mega Frum are stereo so are there going to be any problems if i use a stereo cable?

bigdrum wrote:The pads that i will be drumming onto have only one piezo in them so the output of the pads will be mono, right?

Right.

I saw that all the inputs on the Mega Frum are stereo so are there going to be any problems if i use a stereo cable?

They're all individual (mono) inputs but almost all adjacent inputs can be joined into dual/triple inputs using stereo jacks.