Actually, Doug probably could revisit past steps provided he first finds a meta song capable of reversing the effect of other songs. So he'd play the meta song, then play the song that sent him to the current world, thereby sending him back to the previous world. Give him a few weeks and he'd be able to revisit any previous world.
Alternately, one of the staggers sent him to the Aladdin world. Imaging Doug finding the "Friend Like Me" song and using it to summon a simulacrum of the genie? Genie may well be able to zap Doug to any dimension he cares to name.
One of the most recent Otherearth snippets actually makes me wonder, doesn't Doug know anyone with dimension travel powers? Theoretically, all he needs is to find a simulacrum creation song based upon someone with those powers, and he'll be able to dimension hop for a few minutes every day.
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"Anyone can be a winner if their definition of victory is flexible enough." - The DM of the Rings XXXV
Alternately, one of the staggers sent him to the Aladdin world. Imaging Doug finding the "Friend Like Me" song and using it to summon a simulacrum of the genie? Genie may well be able to zap Doug to any dimension he cares to name.
One of the most recent Otherearth snippets actually makes me wonder, doesn't Doug know anyone with dimension travel powers? Theoretically, all he needs is to find a simulacrum creation song based upon someone with those powers, and he'll be able to dimension hop for a few minutes every day.
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"Anyone can be a winner if their definition of victory is flexible enough." - The DM of the Rings XXXV