On Thu, May 22, 2008 at 02:09:58PM +0200, Julien Claassen wrote: It's quite a lot of work, and how you would approach it depends for a large part on your experience in doing it. Creating a new stop requires a mix of analysing recordings of single pipes, and use of 'background knowledge' you acquire from acoustics and psychoacoustics. If you get somewhat experienced you can in some cases skip the technical analysis, guess most of the parameters, adjust them interactively, and compare by ear with either recordings of single pipes, or music performed using the stop you want to create. The latter is always the final step anyway. The numbers of possible parameters for a single stop is quite large. They are defined at intervals of a minor third, every C, Eb, F# and A. For each of these notes you have 64 harmonic levels 64 harmonic attack speeds 64 harmonic attack profiles 64 random variation ranges plus volume, unstability, random detune, systematic detune, attack detune, attack detune time, release detune, release detune time This is a total of 5544 parameters for each stop, plus binary flags saying if they are defined or not. Aeolus has a built-in graphical editor for these parameters. The ae0 files which contain them are binary, there is currenlty no textual form of them. You could write a conversion tool... Not all parmaters for all notes need to be defined - if a note is missing the value will be interpolated from the values of the two nearest notes which have that parameter defined. Each parameter must be defined for at least one note. There is no interpolation in the harmonics dimension as the 64 values are assumed to be independent. But instead of this you can have a 'freehand drawing' mode in that dimension. -- FA Laboratorio di Acustica ed Elettroacustica Parma, Italia Lascia la spina, cogli la rosa.