One way the DD 20 does this is by turning the
feedback to 100% (infinite) or any feedback setting for that matter,
and then press the "off" FS. The delay will keep playing without adding to the
loop. Another way is to set the FB and then advance to the next memory location.
The delay will play forever (100%) or whatever you set. This is until you
advance once more.
Lot's more on this of course at http://www.loopers-delight.com/tools/bossDD20/bossDD20.html
j
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