New Serdaco product in development - Serdaco DeX

[BobanSpasic]

From the combination of circumstances, I am excited to write here on behalf of Serdaco, officially.
I am not a Serdaco employee, but I've got somehow into the position to be a connection between this community and Serdaco.

So, I've got the Serdaco owner interested in MiniDexed, and he decided to produce dedicated hardware - Serdaco DeX.
It will be based on the design of Serdaco SF2: https://www.serdashop.com/SF2
My question is, which function would we like to have on these 4 buttons? We got the chance to decide it here before it goes into production.
What do you think about the case color?

[probonopd]

If there are 4 buttons and no rotary encoder, then it'd probably need to be arrow up, arrow down, arrow left, arrow right?
I am using one of my builds with these 4 buttons and no encoder.