Right, that's why it will be hard to add microtonal support as an afterthought instead of designing it in from the beginning. Anyway if the number of pitch classes you need doesn't exceed 128, it's possible to edit the score with Rosegarden or another sequencer and translate the MIDI file to a microtuned one with Scala. You need to remember which note number maps to which pitch because the score won't look the way it sounds. Or a MIDI Tuning event. In Scala you have the choice between pitch bends and MIDI Tuning Standard messages when translating a MIDI file. Then you can render it with Timidity for example. Unfortunately Timidity doesn't support the MTS, but for example Audio Compositor on the Windows platform does (free demo). Fetch Scala at http://www.xs4all.nl/~huygensf/scala It can also do realtime MIDI relaying with pitch bend tuning. Manuel