Hello,
First of all let me acknowledge that XMPlay is a great product, and its MIDI playback capabilities specifically are very good. Now for the question. On my synth keyboard I can adjust temperament by choosing one of the presets (with the base note, e.g. "Kirnberger C") or directly specifying detuning (in cents) for each of the 12 notes in the octave. This tuning is then applied to the playback of all notes.
E.g. C (0) C# (-2) D (+5) E (+6), and so on.
What are chances of such feature being added to the MIDI plugin? Some types of music require certain tuning, and on top of that being able to switch temperament before or during playback without modifying the MIDI file itself sounds like a cool feature.
Thanks!