xensynth http://archive.org/details/xensynth has abstractioins [ntof] and [ntof~] which are not bound to the midi 100 cent interval intervals can be set with a list message in frequency ratio format xensynth can load scala .scl tuning files and when a .scl file is loaded it sends the interval list to all the ntof and ntof interval arrays. ntof was based on xtof , memory of original xtof library name escapes me at the moment. i do remember the xtof version i had didnt work with non octave tunings so i rewrote the patch to work with non octave tunings and added the audio rate version seems like the differences in the control and audio versions might have been [mod] and [%~] or % in an expr~