The DT is way more limited than the Octatrack. If you can get both for almost the same price I would definitely go for the OT.
Reasons:
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Stereo Sampling: when you sample something with has stereo effects on it (like the output of the machine itself) this is a MUST-have for me.
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Dynamic Looping: Record inputs and play them with all kind of effects while they still recording
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On the DT you cannot mute the incoming signal while recording
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Storage Card Slot: You are not limited to the 1GB internal storage like on the DT
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Background tracks: The OT can play a background track directly from the storage card without ANY time length limitation.
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Song Mode
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More inputs and outputs
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Scenes and the scene slider
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time stretching of samples
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Sample slices
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… and many other things that I just can’t remember yet …
In a sense the DT is FASTFOOD, quick and almost instant to learn/use, but with vast limitations.
The OT is more of a proper meal - but of course, all these possibilities requires some learning effort.