This was a fun one!
I am a big fan of the rebounds with the circular scrubbers, but I can see it being a major user issue trying to navigate forwards/backwards with that unless it's very large. I went with something a little more subtle, but I tried to still emulate the sleekness of the circular scrubber.
Also, if you haven't listened to Teebs, I can't recommend him enough. This album, Ardour, is especially great for background working music :)