[LAU] setBfree: Gain sweller from lin to log characteristic

Dear list, I'm mainly using Pianoteq and setBfree for live performance. To quickly adapt my sound volume of both SoftSynths together I'm using a foot pedal to send Midi volume commands to both applications. Unfortunately that is not working very well for both programs are using the Midi volume values (0-127) differently. Pianoteq adjusts its output volume according to a more logarithmic manner while setBfree seems to handle it linearly. Thus if I adjust both volumes to a similar SPL for Midi value = 127 the organ is way to loud at lower levels compared to Pianoteq. Meanwhile I have found the location in the source of setBfree where I could make adjustments. I have measured the logarithmic dependency of Pianotec's Midi to volume characteristic and found a formula to be used in setBfree to get a similar performance. It would be nice if this could find its way into the original source. Now I have the following questions: Does anyone of you know if the original swell pedal of the B3 is changing the volume in a linear or logarithmic way? Maybe if the original B3 uses a linear characteristic we should not change setBfree's code. The function I'm using is mimicking Pianotec's characteristic. Maybe there is a more global approach for changing from linear to logarithmic behavior over Midi volume values? Surely for me it's ideal when both Synths have same characteristic. Do you know a source where I can find more general info about lin<=> log conversion of Midi volume in software? How is it handled in other professional programs? I know that every amplifier uses a logarithmic pot for volume control to follow more the human loudness perception. Do you think its worth the effort to send a patch to github's repository (I've never done such a thing so far)? Thank you for your time Gerhard