add note about audio channels

issues.md

@@ -2,7 +2,7 @@
 
 Please read this first:
 
-- **Q:** Can LosslessCut **crop, resize, stretch, mirror/flip, overlay text/images, watermark, blur, redact, reduce quality/re-encode, create GIF, slideshow, burn subtitles, color grading, fade/transition between video clips, fade/combine/mix/merge audio tracks or change audio volume**?
+- **Q:** Can LosslessCut **crop, resize, stretch, mirror/flip, overlay text/images, watermark, blur, redact, reduce quality/re-encode, create GIF, slideshow, burn subtitles, color grading, fade/transition between video clips, fade/combine/mix/merge audio tracks, mute audio channels or change audio volume**?
   - **A:** No, these are all lossy operations (meaning you *have* to re-encode the file), but in the future I may start to implement such features. [See #372](https://github.com/mifi/lossless-cut/issues/372). Related: [#643](https://github.com/mifi/lossless-cut/issues/643).
 - **Q:** Is there a keyboard shortcut to do X?
   - **A:** First check the Keyboard shortcuts dialog. If you cannot find your shortcut there, [see this issue.](https://github.com/mifi/lossless-cut/issues/254)