This procedure is a bit more straightforward on OS 1.13:
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Press and hold the [PATTERN] button.
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Select and hold a PLACEHOLDER pattern key. This must not be a pattern you wish to add to the beginning of the chain. Continue holding this key throughout.
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Release the [PATTERN] button. This will clear the PLACEHOLDER pattern from the chain. The chain will remain active, however, as long as the PLACEHOLDER pattern key remains held down.
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Now you can press and hold the [PATTERN] button and select patterns to add to the empty chain.
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If you wish to select the PLACEHOLDER pattern, continue holding the pattern key of the last pattern added to the chain before releasing the PLACEHOLDER pattern key.