Another thing I noticed with firmware 2.07 that is a little concerning. (I know its only my opinion but I feel like these idea's could be useful).
-Normally you can navigate up and down the UI with the two forward/back buttons below the scroll wheel but when you're in the system settings and play settings menu's, the forward/back buttons function change and the only way to navigate up and down these menu's is by using the scroll wheel.
Considering the scroll wheel is mechanical and probably the most likely part of the device to fail (apart from the battery), this is concerning. Being able to use every aspect of the device without the scroll wheel would be a positive. What if -while in system/play settings menu's- the scroll wheel is set to change the volume, the volume buttons are for changing the settings and the forward/back buttons are for navigating up/down the UI?
The same concept would need to be applied to the equaliser menu, although I'm not entirely sure how just yet.
That would mean that 100% of the UI can be navigated without the scroll wheel.
It also means that if an X5 scroll wheel breaks out of warranty, the device can still be used in its entirety. Customers with broken scroll wheels are less likely to be as upset about it, thus less likely to complain and give the device (Fiio) negative feedback.
-I don't understand why the volume needs to dip when I enable the equaliser. For people like me with planar magnetic headphones with high ohms (75 ohm's for my LCD2's), I've normally got the volume at around 75/80 on high gain. When I turn the equaliser on, I've found myself turning the volume up to around 85/90 on high gain. It feels like I'm being penalised for using an equaliser.
-When the lock screen is on, the volume buttons have a second function.
up = short press turns the volume up and long press repeats the track or previous track.
down = short press turns the volume down and long press skips to the next track.
This feels counter intuitive, it confused my girlfriend too. It feels like next track should be long press up.
-Scrolling the main menu feels clunky. I assume its due to a lack of animations. Obviously most of us here would prefer a snappier UI than fancy animations but if it could be implemented without impacting on feel or (most importantly) sound, a smoother main menu would be nice.