Discord user Natt Akuma built a VERA PSG+PCM module for FOSS chiptune tracker, Furnace. I have made an export function for Furnace to export VERA/YM2151 tunes into ZSM format which can be played back on Commander X16 using my Zsound library.
Unfortunately, they're busy fixing bugs and finalizing features for the current rc target of Furnace, and likely won't merge my pull request until after that has been completed, but you can grab and compile a copy from my fork at https://github.com/ZeroByteOrg/furnace/tree/ZSMv1/
Here's a video of a VERA tune from the Furnace Discord server playing back on X16: