Shynixn/BlockBall#529 Added ShyParticles to MCTennis. Particles can be accessed using the /mctennisparticle command, which can be played on all MCTennis events (e.g., goal scored, ball spawned, etc.) via commands. More details are available on the ShyParticles wiki.
Shynixn/BlockBall#529 The double jump sound and ball kick sound have been replaced by ShyParticles effects. You can find the new effects in plugins/MCTennis/effects. To apply the new values to your arena file, execute /mctennis toggle <game> on your arena files.