I'll answer your questions as best I can. When you initially power on, you will see the Xuelin logo (looks like a sound meter readout) which changes pretty quickly to the initial menu "page". On this screen, there are 3 icons, 1 that looks like a music symbol, one that looks like a file symbol, and the last looks like a settings symbol. The symbols line up Left to right with the music symbol on the left, file symbol in the middle and the settings symbol on the right. You hit the advance "button" on the touch screen to move to the middle file symbol and immediately you see a screen that says Flash or SD card. You select either Flash or SD card and this immediately opens to a screen that reads something like Music or Playlist. I have all my music entered in alphabetical order by artists which are under the music file (I use drivesort to arrange artists in alphabetical order). As soon as I select Music, then the files immediately appear on the screen. I can see 6 artists on the initial screen, but once you start scrolling, you will see 7 artists on the screen. Once I select the artist, then his/her albums appear. I then select an album and then the songs appear. So to answer your question, the navigation can take a few to several seconds depending how well you maneuver the touch screen. The touch screen is very responsive on my unit, but if you hit the select button at an angle, you may get the "back" response by mistake. But once you select an item, the screens open immediately without delay. So the bulk of the time (which varies based on navigation skill) is spent navigating, not waiting on the player to respond. You will get a micro USB cable with the unit. I think the end that connects to the player is the same type that is used by some smart phones. It is a micro USB connector, but it is not the same one that is used by the iHiFi 960 or Colorfly C3. The firmware on the 770 is the same as the firmware on the 960, so the navigation is similar for the 2 players. Although the 770 navigation is not really difficult, it does take some time to get used to. I personally find the touch buttons on the 960 a bit easier to maneuver. The 770 is more like the Colorfly C3 when it comes to navigating. One thing you should do (if you do decide to by the 770) is set the Light time (under Display setting) for at least 10 seconds when you are first getting used to the player, because once the light time elapses, then the player locks and you have to press 2 "buttons" in sequence on the touch screen to open the display back up. Again, not difficult to do, just a bit frustrating at times.
One other way to access individual songs (which I never do this way) is thru the icon screen, you want to select the music symbol and then this immediately goes to a screen that allows you to select "resume play", "all music" or "dir list". If you select "all music" then the you open a list of all your songs in alphabetical order (screen shows 7 songs at a time), but scrolling is pretty fast with the touch screen. If you choose "dir list", then this will get you to the screen that offers Flash vs SD card. I hope this helps.