Better than having nothing from Apple, however.... – Media Mix Review

Installed on iPhone 4 As an update to my comments below, this version corrected ALL of the issues mentioned and TOTALLY meets my needs. Will purchase to take advantage of changing the crossfade amount of time. Media Mix's crossfade function works exactly as I hoped it would. As others mentioned, pressing the <FORWARD> button does causes two songs to play at the same time. Also, pressing the <BACK> button causes the now-playing song to start over, but with the initial play still going (i.e., the same song playing at the same time but from two different starting points). However, pressing the <PAUSE> button after the <FORWARD> or <BACK> button, and then the <PLAY> button, appears to circumvent this problem, thus returning to only one song playing.
Review by Patiently awaiting perfection! on Media Mix.