Is it possible to modify the rate scale for EdgeTTS voices?

[mrendor12]

Recently, I was wondering about the range of the speech rate parameter for such voices, and in correspondence with the creator of Balabolka, I learned that this range varies from -50% to +200%. He also mentioned that due to a questionable decision in SAPI 5 to limit the scale to only -10 to +10, your program uses the following code in TTSEngine.cpp to convert rate values:

m_ssml.append(std::to_wstring(rate >= 0 ? rate * 20 : rate * 20 / 3)); // -10~10 => -(2/3)~+200%

Is it possible for me to modify these parameters somewhere in the files?

A step of 20% is too large for me, and at a speed of 4 (80%), it's already uncomfortable for me to listen. Instead of the unnecessarily high speech speed, I would like to have the ability to choose a slower speed more finely. If we take 80% as the maximum, the step per division becomes 8%. Which is more convenient for me.

Could you consider adding settings to adjust the step or set custom values for individual SAPI 5 speed units? And, if possible, could such settings be made specific to different voices rather than global?