I split the section and then delete it but I then need to drag the end of the remaining clip so I cna get a reverb tail to continue, however every time I d this, the old deleted material re-appears?

Use the Apply Trimming function. Select the clip(s) and choose Clips > Apply Trimming from the Track View menu.

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Scott R. Garrigus - http://www.garrigus.com
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hahaha...found it just before I checked back for an answer. Thanks for replying though :)

No problem. :)