TapNoiseA Mac input source controls how key presses become characters. Add the languages or layouts you need in System Settings › Keyboard › Text Input › Edit, then switch using the Input menu.
Keep the active source visible
Enable the Input menu in the same Text Input settings. Its visible layout indicator helps explain why punctuation or a shortcut behaves differently after switching languages.
Use a scratch document to confirm the new source before entering a long message. Switching input sources does not translate text you already wrote.
Choose a convenient switching method
Keyboard settings can assign the Fn or Globe key to change the input source. Available options vary with the keyboard. Inspect the action currently assigned before changing it, since the key may already open emoji or start another feature you use.
For layouts with additional composition options, review the language-specific settings. A Chinese, Japanese or Korean input method can involve a candidate-selection step that is not equivalent to an English keyboard layout.
Keep audio expectations separate
TapNoise’s keyboard sounds are based on key positions, not the words you compose. Changing language therefore does not make the app read or pronounce the entered text.
If a symbol is hard to find after switching, Keyboard Viewer shows the selected layout. If a shortcut stops working, check the menu’s current combination before concluding that the keyboard or a sound utility has intercepted it.
Source: Apple’s Input Sources settings, TapNoise privacy model.