Well some have done things in 7" but the major issue is not so much the making it work but making it robust enough to work in the kind of environment that musical stuff happens. The zynthian standard is a 3.5" screen in a zynth case, and given one of the listed tests for the new release is pour 500ml of water over the case and make sure it suffers no adverse reaction you begin to realise that getting it to work on a bench and getting it to do musical stuff are steps on a path.
It’s really how you mount it … Have a look here . . .
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