Update README

README.md

@@ -71,7 +71,7 @@ The [multi-track](https://github.com/mdn/webaudio-examples/tree/main/multi-track
 
 ### Multi track advanced
 
-The [multi-track-advanced](https://github.com/mdn/webaudio-examples/tree/main/multi-track-advanced) directory contains an enhanced version of the original multi-track example. This version adds volume faders for each track, providing precise control over individual audio levels. It also introduces solo buttons, which allow the isolation of a specific track by bypassing all other tracks. [Run the example live](http://mdn.github.io/webaudio-examples/multi-track-advanced/).
+The [multi-track-advanced](https://github.com/mdn/webaudio-examples/tree/main/multi-track-advanced) directory contains an enhanced version of the original multi-track example. This version introduces a [`GainNode`](https://developer.mozilla.org/en-US/docs/Web/API/GainNode) for each track, providing precise control over individual audio levels through volume faders. It also includes solo buttons, enabling the isolation of a specific track by muting all other tracks. [Run the example live](http://mdn.github.io/webaudio-examples/multi-track-advanced/).
 
 ### Offline audio context