Welcome nylonius to this forum!
I just checked to make sure, there is no bug in the octave stretching. Here is a short excerpt of the manual:
"It is quite usual to stretch octaves in a piano, but how much should they be stretched?
Well… this might be a matter of taste! Adjust it to your own taste by modifying
* The octave stretching parameter. The main effect will be observed in the treble
notes.
When the octave stretching parameter is set to 1, the stretching follows the natural
inharmonicity of the strings (depending on the string length), so there still is a slight
stretching. If you want no stretching at all, then use the flat temperament."
Reading it again, I find it actually a bit confusing. Here is a complementary information:
- when you select the flat temperament and set the octave stretching parameter to 1, then there is no stretching at all,
- but when you select the flat temperament and set the octave stretching parameter to another value, then the stretching is applied uniformly on all octaves, contrarily to the usual stretching which affects only the highest octaves. Hence, for large values, it gets more noticeable in the medium range with flat temperament than with any other temperament. That's just because the context is different: with flat temperament, we mimic a synthesizer whereas with another temperament, we mimic a piano tuner.
Hope I didn't make it even more confusing!
