DD-20 Tempo bug or feature

[Michał Wiernowolski <mihalw@gmail.com>]

When you change the effect mode twice (by rotating Mode knob or pushing
right pedal) the sound stops.
I've just noticed that when you push Tempo button a couple of times it
starts playing again part of what was recorded earlier.
It seems like a bug (the memory is not cleared when switching), but it
may be a feature,
as it allows you to regain control over previous, disengaged loop.

Another interesting feature of the Tempo is the ability to
multiply/divide loop.
You may set it to 4 sec./quarter note then switch the tempo to whole
note and you have
a 16 sec. loop built from the initial 4 sec. material (unlike Ted
Killian's Time Trip).
The negative is that stepping through shorter times distorts the audio a
bit (within switching time,
so the faster you do it the better).
Then you may divide the loop by setting the tempo to half note (8 sec.) 
etc.

Michal