Variable speed playback -- including the ability to toggle the correlating change in pitch on or off.
Was really happy to find that VLC has this same feature on Mac and Windows (can't speak for Linux). I've also run into portable audio players that do this but with no pitch change and a limited range, for listening to audiobooks and podcasts I assume.
Pitch change is a big one for me since I listen to a lot of old electronic dance music, which is meant to be manipulated on a turntable of course... A lot of this music was pressed/recorded at a slower velocity than it was meant to be played in person. Brings out its authentic character it should have when you speed it up, while other cuts really become rich when you slow them down, etc... simply meant to be, well missed & amazing to have on a digital audio player.
I'm no developer and maybe this isn't compatible with Strawberry. But it would be excellent.
If there's already a way to do this and I couldn't find it, let me know
Thanks for all the hard work on this project. A friend told me about it and I owe it a donation soon