*Always* the house system. Never used own system. Still never had a problem. As I said - it's a keyboard - not an acoustic drum kit. (Indeed, if I'm doing a venue I've never done before, I'll simply tell the soundperson - "it's a keyboard" whilst presenting them with a single jack lead to plug into their provded DI )
Not only that - I'm often driving a MIDI-sequenced keyboard backing (tone module/s) and sampler/s down the same mono cable....
For sound-checks I fire off a pattern on the module and join the soundperson at the desk/in the auditorium to get an EQ we like to suit (try doing that with an acoustic!). I'll stay there whilst the whole band plays as well to get a basic mix to suit.
#EasyLife
As I said - it's NOT an acoustic kit and doens't need to be treated like it is