Alovolt is a hidden clockwise volt (originally an unintentional bug in Action Supercross). It has a short delay and it's mellower but it keeps rotating the bike compared to a regular clockwise volt that instead fades quickly after the initial fast motion.
It can be performed by pressing the left and right volt keys simultaneously. Because both Action Supercross and Elasto Mania check for keyboard input on every frame, it's harder to do with a simultaneous keypress if the fps (frames per second) is high. It's generally accepted to do an alovolt by binding a separate alovolt key in the (b)elmaconf12.exe found in newer versions.