In order to perform IWC (infinite Wall Clap) you must have the bongo microphone set to "manual; notch 1 in the settings. After this, you need to jump into a wall, and blow into the microphone so DK is clapping every frame. Keep in mind this can only be done/ is useful on certain walls in the game. If you need more help or are interested in doing Donkey Kong Jungle Beat speedruns, you can message any of the leaderboard mods on twitch, or post here.
Hope this helps :)