I don't use 'phones except whn I'm playing keyboards live with a band so that I can tune/tweak my audio output without going through the PA/mixer.
When I mix audio in my studio I start by playing the midi through my Yamaha synth/arrangers (PSR3000/Tyros and Motif XS7 boards) via my PC using a Soundblaster Xtreme HiFi sound card into my Samson studio monitors. Once the tune is recorded (I always use either Audacity or Sonar Pro.) I then I play it through my Panasonic Hi Fi speakers (12 inch) such as would be used for a home CD system as most of the audios are going to be burned onto CD for clients. I also play the audio through my theatre Bose surround sound system which doesn't tell me much but it sounds great; then I play it through my Phonic (USA) 800 watts per channel PA system almost flat out (I have a totally sound proof studio underground so it doesn't bother anybody) which is similar to what a live band would use. Each system sounds different.
The final master production is always a balancing act between these various sound systems and the human ear. Many people have differnt frequency responses in their hearing, and you can't please everybody. Personally I am particularly sensitive to higher frequencies, so I like to tweak/EQ on the advice of other pros such as George Lewis and Baz Woollett who have different likes and dislikes.
I don't use sound fonts, ProTools or any other audio software as I have everthing I need already on my workstations.
That probably doesn't help much so if you want to chat further please email me at
tonykiek@hotmail.com