I am looking for a sequencer software to use for editing midi files, or Yamaha .sty style files.
Does anyone have experience with which program is recommended/best suited for this purpose?

Hi
Michael Bedesom's stylemaker program might be worth considering. http://www.jososoft.dk/yamaha/software.htm
As far as an inexpensive sequencer
PG's Powertracks Pro http://www.pgmusic.com/powertracks.htm
there is a Demo to try.

I used to use One Man Band http://www.1manband.nl/omb.htm
to create my own styles for it & my PSR.

best wishes
Rikki

Thanks for the reply.
I got CasmEdit (not from jososoft) which can split a .sty file into 2 parts - the casm data, and the midi data.
Can I just take the midi data back to the kb as a song and edit it, or I should be using a sequencer?
And the sequencer can edit individual notes and info like on the kb?
Thanks.