When Phone Locks Up (Android v.5), ADD a Skip Back button (only forward skip button shows up).
This is handy b/c when you skip forward to skip ads, you sometimes skip too far, so you need to skip back to the end of the ads. The backwards skip button is missing for this (Google Music, for instance has a 10s back & 30s forward button on the lock screen).
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David
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You can customized the player notification in the app Settings/Notifications/Player