Unfortunately the old Votrax sample player has been completely removed.
The sad thing is that the old "fake" sample player used to have a compiler flag USE_FAKE_VOTRAX that could have been used to switch between the two options, but it was all just removed completely. I understand how groundbreaking the new Votrax simulator is from a technical perspective (and yes, I know that is the primary goal of MAME), but IMHO it should have been left as a conditional compile until it was more fully baked.
I just reverted the checkin 2c79c1ed in my MAME build to get a 0.183 that sounds right from a player perspective. Hopefully they get it working better soon.