I always stand, but I do almost 100% 1-hour shows. If it's sets, I still stand. I prefer to sing this way and move around to goof with the crowd.

I sit at home when practicing
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Yamaha 920 / Yamaha DGX-670 / Maui 5 Go (2) / Senn e935 / Sony C80 / Tascam DP24sd / ATEM Mini Pro switcher (studio)