Synthia - how to replace default samples?

Hi team, not sure if there is a document anywhere or anything to help, but we’d like to know for Synthia 1.0, how to

  1. replace default sound samples which are all kind of drums with some other samples, i.e. upload to the Synthia (we mean samples like Piano note C etc, not a mic-recorded sample), maybe you can offer something like default firmware modification - will also work
  2. is there any way to ‘extend’ the length and make it longer than 16 beats, for instance if we want to compose a 128-beats long track, is there any way of doing it?