How do you help your intermediate and basic level English learners develop phonemic awareness?

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Phonemic Awareness is the ability to identify, figure out, and recognize and produce the mental effort to work with the individual sounds in spoken words. I have been using a method which has the student move a slider on a shared screen for each separate sound. This has produced some beneficial effects.

What have you used to build your student's phonemic awareness, and thus improved spelling abilities?