Thank you for this insightful comment. You're right, music keyboard is obviously better than computer keyboard in all ways. I didn't want to argue opposite sta

Thank you for this insightful comment. You're right, music keyboard is obviously better than computer keyboard in all ways. I didn't want to argue opposite statement. Behringer UMX610 looks more interesting, but it's a bit more expensive. Having my old casio, which has nowadays only one really annoying thing (less annoying is broken volume potentiometer, so only one speaker works above ~10% level) - clappy sound (don't know any good term for it) of its keys - I don't have real need for new keyboard (I don't intend to compose being outside of the home, but OTOH having small keyboard next to keyboard would be possibly convenient). It's still unknown about this casio's MIDI capabilities, i.e. whether they are working correctly. First thing I have to do in spare time is get some MIDI on USB interface cable (like Roland UM-1G, which is already more than 100PLN) and test my keyboard on it after years to see whether old problems are still here. As I stated in response to troyal7562, I have some relative pitch recognition skill (not accurate) that combined with the knowledge of key indeed gives good results, but not good enough for real-time transcription-through-play. Well, I can write, but not off-hand, that's the point. Also via playing you can develop and change your ideas further, so I wouldn't call this additional stage as trapping. Remember I am talking about prototyping, not crafting final version of some music piece. That is also why having it in my computer, when I can (or should be able to) easily alter, improve and combine my musical sketches, is that important. But surely having perfect sound recognition skill would ease all of my efforts.