Don Veca is an unofficial name of the sound driver created by Don Veca for the Sega Genesis and Mega Drive. While Veca was a composer, he rarely composed music with his driver and instead other composers used his sound driver. The driver is probably best known from the line of NHL titles EA developed throughout the 90's. A little over 10 games used the driver.
The first game to use Don Veca's sound driver was MLBPA Baseball, which was only released in the USA. Some of the other titles using the driver got a European release, but the driver was never used in Japanese video games.
Don Veca's sound driver appears to convert MIDI files for use with the YM2612, in a similar fashion to the GEMS driver. The driver uses the Genesis's 68000 and Z80.