Mono / stereo

Hi everyone !

I know that it could be a stupid question but i would like to know which is the best Way to convert mono in stereo…

I Will make an example to explain my self better…

My monomachine has 2 inputs A B… If I have 2 synth like a Mopho and a nother brand, i Will integrate the mopho in the MnM trough the A input and the other in the B input…

now how I can convert this mono signal in a stereo?

I don’t care the method, it can be in the MnM, OT or Ableton live…

Thanks a lot !!!