Bruno,

Sorry to hear about your hard effort with little return.

I use some words in my 900 (until I memorize them) and it works out great. However, I do stand and play for an hour.

You do know you have different keyboard fonts to choose from (?), so that helps making the words fit.
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Yamaha 920 / Yamaha Stagepas 100 BTRs / Senn e935 - LIVE
Roland RD 2000 / Tascam DP24sd / ATEM switcher - STUDIO