Basically you will loose quallity with a non lossless compression like mp3...
Seriously, when playing you need to ask yourself, are you an entertainer ( because thats generally what people pay you for as an OMB) if your answer to that question is yes, then it does not matter how, as long as you entertain...
But then, if you play with a trio in a bluescafe, thats where you are seen as a musician, where people come not to be entertained, but where they come to listen to your live performance..
You can be an entertainer and a musician too!
Pianist, guitarist, or any soloist for that matter can play what ever he/she likes to give their best. AND use whatever they can and want to
embellish their rendition, OK, as long as the style or smf or even the MP3 is not used in place of their rendition i.e. that's faking it to me.
To me, some are saying you should not use these on the keyboard you buy, is like, saying you should not wear a hat or that jacket or big smile when you go onstage to perform, it's fake and should not be part of the show/act/perform/rendition etc... that would just going too far.
If this was about guitars, would some say the same about stomp pedals and loop machines?? lol Sorry Nigel, just stirring....
Allan