I don't know anything about freebsd. Your system seems to be 64 bit, right? First please check if the 64 bit libraries are installed in freebsd-64 on a 'lib64' directory, like in the 64 bit versions of Red Hat Linux. If not, then you need to uninstall drumstick and start again, running cmake with -DLIB_SUFFIX="" in the command line. After installing drumstick you probably also need to run the BSD equivalent of ldconfig to prepare the system to find shared libraries before running any of the drumstick...
I don't understand why do you need a UMX 64 keyboard with VMPK. It is another MIDI controller, just like VMPK. VMPK is just a MIDI controller. It doesn't produce sound by itself. For users' convenience, it includes a Synthesizer: FluidSynth. And of course there is a dialog box to configure some settings like number of periods, buffer size, and the Soundfont file. See the attached pìcture. These settings are only for FluidSynth, and doesn't affect other synthesizers. Buffer size affects latency and...
Here is a fresh build, 64 and 32 bit: x64 https://1drv.ms/u/s!AtNC_afgrZsjvEKO0GhHO5cM2Lb5 x86 https://1drv.ms/u/s!AtNC_afgrZsjvEHYmV-1Recx4XXr
Define what do you mean with 'latency', and what synthesizer settings. To completely remove all the stored settings after uninstalling VMPK, execute the following command in a cmd.exe shell (as administrator): reg delete HKEY_CURRENT_USER\Software\vmpk.sourceforge.net You can use regedit.exe as well to remove the registry data.
Ticket moved from /p/vmpk/bugs/43/
vmpk 0.6.2 windows x86 pitchbend slider output bug
It would be relevant to mention the affected driver was MMSystem, but not the FluidSynth driver. Investigating the problem I've discovered a couple of other affected drivers as well. For your info, this issue should be fixed in r341 of drumstick libs, that is why the ticket was moved here. See https://sourceforge.net/p/drumstick/code/341/
You are fixing the wrong place. Synthesizers are the things producing sound, and some synths can be adjusted to different master tunings, but this depends on the particular synth that you are using (and I cannot guess).